There are 668 twelve-letter words containing A, E, G, L and S, https://www.bestwordlist.com/c/a/5/12letterwordswithaegls.htm
ACKNOWLEDGES ACROGENOUSLY ACROMEGALICS ACROMEGALIES ADULTERISING
AEROSOLISING AEROSOLIZING AETIOLOGISTS AGGLOMERATES AGGLUTINATES
AGGRESSIVELY AGNOIOLOGIES AGRICULTURES AIGUILLETTES ALBUMENISING
ALEGGEAUNCES ALLEGORISERS ALLEGORISING ALLEGORIZERS ALLOANTIGENS
ALMIGHTINESS ALPHATESTING AMBLYGONITES AMELOGENESES AMELOGENESIS
ANGELOLOGIES ANGELOLOGIST ANGIOSPERMAL ANGLEBERRIES ANGLERFISHES
ANGULARITIES ANTHOLOGISED ANTHOLOGISER ANTHOLOGISES ANTHOLOGIZES
ANTIGROPELOS APPETISINGLY APPLERINGIES ARCHEOLOGIES ARCHEOLOGIST
ARCHIPELAGOS ARGILLACEOUS ARISTOLOGIES ASPERGILLUMS ASSEMBLAGIST
ASSOILZIEING ASTACOLOGIES ASTRINGENTLY ASTROGEOLOGY AUTECOLOGIES
AUTOGENOUSLY BALNEOLOGIES BALNEOLOGIST BATTLEWAGONS BEADBLASTING
BEGGARLINESS BELLYACHINGS BEPLASTERING BESTIALISING BESTIALIZING
BESTRADDLING BILLINGSGATE BLUEJACKINGS BLUESNARFING BRACHYLOGIES
BREASTPLOUGH CABLECASTING CALENDERINGS CALLIBOGUSES CALLIGRAMMES
CALYPTROGENS CANDLELIGHTS CARAMELISING CARDIOLOGIES CARPHOLOGIES
CATALOGUISED CATALOGUISES CATALOGUIZES CENTRALISING CENTRIFUGALS
CEPHALALGIAS CEPHALALGICS CHANDLERINGS CHANGELESSLY CHANNELISING
CHASTENINGLY CLADOGENESES CLADOGENESIS CLEISTOGAMIC CLIFFHANGERS
CLISTOGAMIES CLOISONNAGES COLLAGENASES COLLEGIALISM COLLEGIANERS
CONFLAGRATES CONGEALMENTS CONGELATIONS CONVALESCING COURAGEOUSLY
CRANIOLOGIES CYCLOPLEGIAS DAUGHTERLESS DECIMALISING DECOLLETAGES
DECREASINGLY DEERSTALKING DEFLAGRATORS DEGLAMORISED DEGLAMORISES
DEGLAMORIZES DEGLUTINATES DELOCALISING DEMORALISING DEPHLEGMATES
DEPOLARISING DEREGULATORS DESALINATING DESALINISING DESALINIZING
DESCRAMBLING DESOLATINGLY DESPAIRINGLY DETASSELLING DEVALORISING
DEVITALISING DEVOCALISING DIAGNOSEABLE DIAGONALISED DIAGONALISES
DIAGONALIZES DIGRESSIONAL DISAGREEABLE DISAGREEABLY DISANALOGIES
DISEMBRANGLE DISENSLAVING DISENTAILING DISENTANGLED DISENTANGLES
DISGAVELLING DISREGARDFUL DOVETAILINGS DRAWLINGNESS DRUNKALOGUES
EARLIERISING EARSPLITTING EDAPHOLOGIES EGALITARIANS EGOISTICALLY
ELASTICATING ELASTICISING ELASTICIZING ELECTROGRAMS ELLIPSOGRAPH
EMASCULATING EMPLASTERING ENGRAILMENTS ENLARGEDNESS ENLARGEMENTS
ENVASSALLING ERGASTOPLASM ESCAPOLOGIES ESCAPOLOGIST ESCHATOLOGIC
ESPAGNOLETTE ESTABLISHING ESTRANGHELOS ETERNALISING EULOGISTICAL
EVANGELICALS EVANGELICISM EVANGELISERS EVANGELISING EVANGELISTIC
EVANGELIZERS EVERLASTINGS EXHAUSTINGLY EXSUFFLATING FACSIMILEING
FARSIGHTEDLY FARTHINGALES FARTHINGLESS FEDERALISING FESTIVALGOER
FIBERGLASSED FIBERGLASSES FIBREGLASSED FIBREGLASSES FINGERPLATES
FINGERSTALLS FLABBERGASTS FLAGELLATORS FLAGGINESSES FLAGRANTNESS
FORESLACKING FORESTALLING FOTHERGILLAS FRANKPLEDGES FREELOADINGS
FRUGALNESSES GABERLUNZIES GAINLESSNESS GAINLINESSES GALACTOSEMIA
GALACTOSEMIC GALACTOSIDES GALANTAMINES GALIMATIASES GALLBLADDERS
GALLERYGOERS GALLIARDISES GALLINACEANS GALLINACEOUS GALLINIPPERS
GALLOGLASSES GALLSICKNESS GALRAVITCHES GALVANOSCOPE GAMOPETALOUS
GAMOSEPALOUS GANGLIOSIDES GANGSTERLAND GASHLINESSES GASOMETRICAL
GASTROLOGERS GASTROLOGIES GEANTICLINES GELATINISERS GELATINISING
GELATINIZERS GELATINOUSLY GEMMULATIONS GENEALOGISED GENEALOGISES
GENEALOGISTS GENEALOGIZES GENERALISERS GENERALISING GENERALITIES
GENERALIZERS GENERALSHIPS GENIALNESSES GENTIANELLAS GEOGNOSTICAL
GEOLOCATIONS GEOSYNCLINAL GERATOLOGIES GERATOLOGIST GESELLSCHAFT
GESTICULATED GESTICULATES GESTICULATOR GILRAVITCHES GIRDLESTEADS
GLABROUSNESS GLACIOLOGIES GLADSOMENESS GLAIRINESSES GLANDIFEROUS
GLASSBLOWERS GLASSCUTTERS GLASSINESSES GLASSPAPERED GLASSWORKERS
GLASSYHEADED GLAUCESCENCE GLAUCOUSNESS GLOBIGERINAS GLOBULARNESS
GLOMERATIONS GLOSSEMATICS GLUCOKINASES GLUCOSAMINES GLUCOSIDASES
GLUTAMINASES GLUTATHIONES GLYCERINATES GLYCOSIDASES GLYCOSYLATED
GLYCOSYLATES GOALKEEPINGS GOALTENDINGS GOLIARDERIES GONFALONIERS
GOOGLEWHACKS GRACEFULLEST GRACEFULNESS GRADABLENESS GRADUALITIES
GRAMMALOGUES GRANULOCYTES GRAPHOLOGIES GRATEFULLEST GRATEFULNESS
GRATILLITIES GREENMAILERS GREGARIOUSLY GRIDDLECAKES GROSSULARITE
GUERILLAISMS GUERRILLAISM GUTTURALISED GUTTURALISES GUTTURALIZES
GUTTURALNESS GYNIOLATRIES HAEMOGLOBINS HAGIOLATRIES HEADSTRONGLY
HELICOGRAPHS HELLGRAMITES HEMATOLOGIES HEMATOLOGIST HEPATOLOGIES
HEPATOLOGIST HESITATINGLY HOLOGRAPHERS HOLOGRAPHIES HYPERALGESIA
HYPERALGESIC ILLEGALISING ILLEGALITIES INCOGNISABLE INCREASINGLY
INELEGANCIES INTERLEAGUES INTERLINGUAS INTERTANGLES INVESTIGABLE
IRREGARDLESS KEELHAULINGS LAGGARDLIEST LALLYGAGGERS LAMMERGEIERS
LAMMERGEYERS LAMPLIGHTERS LANDGRAVATES LANDGRAVINES LANGBEINITES
LANGOUSTINES LANGUAGELESS LANGUISHMENT LARYNGITIDES LARYNGITISES
LARYNGOSCOPE LATERALISING LAWBREAKINGS LEATHERGOODS LEGALISATION
LEGERDEMAINS LEGIONNAIRES LEGISLATIONS LEGISLATIVES LEGISLATRESS
LEGISLATURES LEGITIMACIES LEGITIMATISE LEGITIMATORS LEMONGRASSES
LETHARGISING LEUCAEMOGENS LEUKAEMOGENS LEXICALISING LEXIGRAPHIES
LIBERALISING LIBERTINAGES LIMACOLOGIES LINEBACKINGS LINECASTINGS
LIPOGRAPHIES LITERALISING LOGANBERRIES LOGANIACEOUS LOGICALITIES
LOGODAEDALUS LOGOGRAPHERS LOGOGRAPHIES LOLLYGAGGERS LONGSHOREMAN
LUCKENGOWANS MAGNETISABLE MALACOLOGIES MALIGNANCIES MANSLAUGHTER
MARGINALISED MARGINALISES MARGINALIZES MARLINGSPIKE MASKALLONGES
MEDICALISING MEGALOBLASTS MEGALOMANIAS MEGALOSAURUS MELLIPHAGOUS
METABOLISING METAGALAXIES METALLIDINGS METALLURGIES METALLURGIST
MILLIGAUSSES MILLIGRAMMES MINERALISING MINERALOGIES MINERALOGISE
MINERALOGIST MISALIGNMENT MISCATALOGED MISCATALOGUE MISCHALLENGE
MISLABELLING MISLEADINGLY MISPLEADINGS MONADOLOGIES MUSEOLOGICAL
NAUSEATINGLY NEMATOLOGIES NEMATOLOGIST NEUTRALISING NIGGARDLIEST
NIGHTCLASSES NIGHTINGALES NIGHTWALKERS NONAGESIMALS NONDELEGATES
NONINTEGRALS NONLANGUAGES NOTUNGULATES NUCLEARISING OCEANOLOGIES
OCEANOLOGIST OLEAGINOUSLY OLEOGRAPHIES OLIGOCHAETES OLIGOPHAGIES
OLIGOSPERMIA ORGANOLOGIES OSTEOLOGICAL OUTRAGEOUSLY OVERSLAUGHED
OVERVOLTAGES PAEDOLOGISTS PALAEOLOGIES PALINGENESES PALINGENESIA
PALINGENESIS PALSGRAVINES PALYNOLOGIES PAPYROLOGIES PARAGLOSSATE
PARALLELINGS PATHOLOGISED PATHOLOGISES PATHOLOGIZES PEDESTALLING
PELARGONIUMS PESTOLOGICAL PHAENOLOGIES PHRASEOLOGIC PILGRIMAGERS
PLAGIARISERS PLAGIARIZERS PLAGIOCLASES PLAGIOSTOMES PLANOGAMETES
PLANTIGRADES PLASMINOGENS PLASMOGAMIES PLASTOGAMIES PLATEGLASSES
PLATELAYINGS PLATEMAKINGS PLEASINGNESS PLECTOGNATHS PLEXIGLASSES
PLOUGHSHARES POLYGRAPHERS POLYGRAPHIES POTAMOLOGIES PRAXEOLOGIES
PRERELEASING PRESAGEFULLY PRESIGNALING PRESIGNALLED PRESLAUGHTER
PRODIGALISED PRODIGALISES PRODIGALIZES PROFLIGACIES PSEUDOLOGIAS
PTYALAGOGUES PYROGALLATES QUARRELLINGS RACEWALKINGS RAMPAGEOUSLY
REALIGNMENTS REASSEMBLAGE REASSEMBLING REASSURINGLY RECANALISING
RECATALOGUES RECHALLENGES RECOGNISABLE RECOGNISABLY REDISPLAYING
REESCALATING REGARDLESSLY REGIONALISED REGIONALISES REGIONALISMS
REGIONALISTS REGIONALIZES REGISTERABLE REGULARISING REGULARITIES
REINSTALLING RELATIVISING REMORALISING REPLASTERING REPOLARISING
RESWALLOWING REVALORISING REVITALISING ROPEWALKINGS SACRILEGIOUS
SACRILEGISTS SALMAGUNDIES SALPIGLOSSES SANGUINOLENT SAPROLEGNIAS
SATANOLOGIES SAUNTERINGLY SCAFFOLDAGES SCAPEGALLOWS SCATTERINGLY
SCATTERLINGS SEARCHLIGHTS SECULARISING SECULARIZING SEIGNIORALTY
SELAGINELLAS SELENOGRAPHS SELENOGRAPHY SEMATOLOGIES SEMIGLOBULAR
SEMIOLOGICAL SENSUALISING SENSUALIZING SEXAGESIMALS SEXANGULARLY
SHAREHOLDING SHATTERINGLY SHELLACKINGS SINGABLENESS SINGLETRACKS
SINGULARISED SINGULARISES SINGULARIZED SINGULARIZES SINGULARNESS
SKILLIGALEES SLANGINESSES SLAUGHTERERS SLAUGHTERIES SLAUGHTERING
SLAUGHTERMAN SLAUGHTERMEN SLAUGHTEROUS SLAVEHOLDING SLEDGEHAMMER
SLEEPWALKING SLOCKDOLAGER SLOGANEERING SLUGGARDISED SLUGGARDISES
SLUGGARDIZED SLUGGARDIZES SLUGGARDLIER SLUGGARDNESS SMATTERINGLY
SNAGGLETEETH SNAGGLETOOTH SOCKDOLAGERS SOMATOLOGIES SPACEFLIGHTS
SPACEWALKING SPARKPLUGGED SPECIALISING SPECIALIZING SPECIALOGUES
SPEEDBALLING SPHACELATING SPLENOMEGALY SPORANGIOLES SPRACHGEFUHL
SPREADEAGLED STAGGERINGLY STAKEHOLDING STAMMERINGLY STANCHELLING
STEAMROLLING STEELMAKINGS STIGMASTEROL STONEWALLING STRANGLEHOLD
STRANGLEMENT STRANGULATED STRANGULATES STREAMLINING STRINGHALTED
SUBLANGUAGES SUBUNGULATES SUPERGLACIAL SWAGGERINGLY SYNERGICALLY
TAGLIATELLES TALEBEARINGS TALETELLINGS TANGIBLENESS TAUTOLOGISED
TAUTOLOGISES TAUTOLOGIZES TELEBANKINGS TELECOTTAGES TELEGRAPHERS
TELEGRAPHESE TELEGRAPHIES TELEGRAPHIST TELEMESSAGES TERATOLOGIES
TERATOLOGIST TESSELLATING TETRAPLEGIAS THEOLOGASTER THERMALISING
TIMETABLINGS TRAGICALNESS TRIANGULATES UMBRAGEOUSLY UNASSIGNABLE
UNCOALESCING UNDERLEASING UNDERSEALING UNGAINLINESS UNGLAMORISED
UNGUICULATES UNPLEASINGLY UNRAVELLINGS UNVULGARISED UNVULGARISES
UNVULGARIZES URBANOLOGIES VEGETABLIEST VESICULATING VICTUALLAGES
VIGILANTNESS WAGELESSNESS WALDGRAVINES WATCHGLASSES WATERGLASSES
WEATHERGIRLS WEATHERGLASS WHOLESALINGS WINEGLASSFUL WRANGLERSHIP
XENOGLOSSIAS XYLOGRAPHERS XYLOGRAPHIES