There are 513 twelve-letter words containing A, D, E, P and R, https://www.bestwordlist.com/c/a/5/12letterwordswithadepr.htm ADRENOCEPTOR ADVISERSHIPS AECIDIOSPORE AECIDOSPORES ALDERMANSHIP ANTEPRANDIAL ANTIPERIODIC ANTIPREDATOR APERIODICITY APFELSTRUDEL APODYTERIUMS APPENDICULAR APPREHENDING APPROPINQUED APPROPRIATED APPROXIMATED ASPHETERISED ASPHETERIZED BASIDIOSPORE BIOGRAPHISED BIOGRAPHIZED BOILERPLATED BOOTSTRAPPED BRADYPEPTICS CALLIGRAPHED CAMELEOPARDS CAMPODEIFORM CANDLEPOWERS CARDIOPLEGIA CARDSHARPERS CARPETBAGGED CARROTTOPPED CHOREGRAPHED CLAPPERBOARD COMRADESHIPS CONSTUPRATED COPYREADINGS CORPORATISED CORPORATIZED COUNTERPLEAD DAPPERNESSES DEASPIRATING DEASPIRATION DECAPITATORS DECIPHERABLE DECREPITATED DECREPITATES DEEPWATERMAN DEEPWATERMEN DEMOGRAPHERS DEMOGRAPHICS DEMOGRAPHIES DEMOGRAPHIST DEPARTEMENTS DEPARTMENTAL DEPAUPERATED DEPAUPERATES DEPAUPERISED DEPAUPERISES DEPAUPERIZED DEPAUPERIZES DEPHLEGMATOR DEPILATORIES DEPLORATIONS DEPOLARISERS DEPOLARISING DEPOLARIZERS DEPOLARIZING DEPOPULATORS DEPORTATIONS DEPOSITARIES DEPRAVATIONS DEPRAVEDNESS DEPRAVEMENTS DEPRECATIONS DEPRECIATING DEPRECIATION DEPRECIATIVE DEPRECIATORS DEPRECIATORY DEPREDATIONS DEPRIVATIONS DEPROGRAMING DEPROGRAMMED DEPROGRAMMER DEPROGRAMMES DERMAPLANING DERMAPTERANS DERMATOPHYTE DESIPRAMINES DESPAIRINGLY DESPERATIONS DESPOTOCRACY DESULPHURATE DEUTERANOPES DEUTERANOPIA DEUTERANOPIC DEUTEROPLASM DIAGEOTROPIC DIAMORPHINES DIAPHORETICS DICARPELLARY DICTYOPTERAN DIMERCAPROLS DIPROPELLANT DIPTEROCARPS DISAPPEARING DISAPPROVERS DISCEPTATORS DISCOGRAPHER DISCORPORATE DISCREPANCES DISCREPANTLY DISOPERATION DISPAUPERING DISPAUPERISE DISPAUPERIZE DISPENSARIES DISPENSATORS DISPENSATORY DISPLEASURED DISPLEASURES DISPRIVACIED DISPROPRIATE DISREPUTABLE DISREPUTABLY DISTEMPERATE DOCKWALLOPER DOPAMINERGIC DOPPELGANGER DOXOGRAPHERS DOXOGRAPHIES DRAFTSPEOPLE DRAFTSPERSON DRAPEABILITY DUPLICATURES DYSPAREUNIAS EAVESDROPPED EAVESDROPPER EMPARADISING ENDOPARASITE EPHEMERIDIAN EXPECTORATED EXPROPRIATED EXTRAPOLATED FLAMEPROOFED FLAPPERHOODS FRANKPLEDGES GLASSPAPERED GRADUATESHIP GRANDEESHIPS GRANDNEPHEWS GRANDPAPPIES GRANDPARENTS HALOPERIDOLS HAMPEREDNESS HANDICAPPERS HANDYPERSONS HARUSPICATED HECTOGRAPHED HELIOGRAPHED HEPTAHEDRONS HORRIPILATED HYDNOCARPATE HYDROCEPHALI HYDROCEPHALY HYDROGRAPHER HYDROPATHIES HYDROTHERAPY HYPERACIDITY HYPERCHARGED HYPERDACTYLY HYPERDULICAL IDEOGRAPHIES IDEOPRAXISTS IMPENETRATED IMPERFORATED IMPERIALISED IMPERIALIZED IMPERSONATED IMPIGNORATED IMPONDERABLE IMPONDERABLY IMPROPRIATED IMPROVISATED INCORPORATED INTERPLANTED INTERPLEADED INTERPLEADER INTERPOLATED ISODIAPHERES JELLYGRAPHED JEOPARDISING JEOPARDIZING JEOPARDOUSLY LAMPADEDROMY LEOPARDESSES LEOPARDSKINS LEPIDOPTERAN LITHOGRAPHED LOUDSPEAKERS MADREPORIANS MADREPORITES MADREPORITIC MALIMPRINTED MANSPREADERS MANSPREADING MEDIATORSHIP METAPERIODIC MICROGRAPHED MIMEOGRAPHED MISAPPREHEND MISPERSUADED MISPERSUADES MISPROGRAMED MOUSETRAPPED MUCKSPREADER NEWSPAPERDOM OBTEMPERATED OPPIGNERATED OPPIGNORATED ORTHOPAEDICS ORTHOPAEDIES ORTHOPAEDIST ORTHOPEDICAL OUTSPREADING OVERCANOPIED OVEREXPANDED OVEROPERATED OVERPACKAGED OVERPEDALING OVERPEDALLED OVERPERSUADE OVERPREPARED PACHYDERMIAS PACHYDERMOUS PADDLEBOARDS PAEDERASTIES PAEDIATRISTS PAEDOMORPHIC PAMPEREDNESS PAPPARDELLES PARADOXURINE PARAHYDROGEN PARALDEHYDES PARALLELISED PARALLELIZED PARAMEDICALS PARAMETRISED PARAMETRIZED PARAPERIODIC PARAQUADRATE PARASCENDERS PARASCENDING PARASITICIDE PARASPHENOID PARASUICIDES PARFOCALISED PARFOCALIZED PARTICIPATED PARTICOLORED PASQUINADERS PASTURELANDS PECULIARISED PECULIARIZED PEDANTOCRACY PEDANTOCRATS PEDIATRICIAN PEDICELLARIA PENTACRINOID PENTAHEDRONS PENTAHYDRATE PERACIDITIES PERADVENTURE PERAMBULATED PERDURATIONS PEREGRINATED PERICARDITIC PERICARDITIS PERICARDIUMS PERICHONDRAL PERICHONDRIA PERICLITATED PERIODICALLY PERIODONTIAS PERLUSTRATED PEROXIDATION PERSEVERATED PERSONALISED PERSONALIZED PETRODOLLARS PHELLODERMAL PHILANDERERS PHILANDERING PHOSPHORATED PHOTOGRAPHED PLACEHOLDERS PLANTIGRADES PLASTERBOARD PLEURODYNIAS PONDERANCIES PONDERATIONS POSTCARDLIKE POSTGRADUATE POSTMERIDIAN PRASEODYMIUM PREADJUSTING PREADMISSION PREADMITTING PREADULTHOOD PREAMBULATED PREANNOUNCED PREAPPOINTED PREASSEMBLED PREAUDIENCES PREBENDARIES PRECANCELLED PRECAUTIONED PRECEDENTIAL PRECIPITATED PREDECEASING PREDEPARTURE PREDESIGNATE PREDESTINATE PREDIABETICS PREDIALITIES PREDICAMENTS PREDICATIONS PREDISCHARGE PREDISPOSALS PREDOCTORALS PREDOMINANCE PREDOMINANCY PREDOMINATED PREDOMINATES PREDOMINATOR PREFIGURATED PREFORMATTED PREHARDENING PREHARVESTED PREINSTALLED PREJUDICATED PREJUDICATES PREMEDICALLY PREMEDICATED PREMEDICATES PREMEDITATED PREMEDITATES PREMEDITATOR PRENOMINATED PREOCCUPATED PREORDAINING PREORDINANCE PREPAREDNESS PREPONDERANT PREPONDERATE PREPROGRAMED PREPURCHASED PREQUALIFIED PREROGATIVED PRESIDENTIAL PRESIGNALLED PREVARICATED PRIVATDOCENT PRIVATDOZENT PROBOSCIDEAN PROCATHEDRAL PROCEDURALLY PROCTODAEUMS PRODIGALISED PRODIGALISES PRODIGALIZED PRODIGALIZES PROLIFERATED PROMUSCIDATE PROOFREADERS PROOFREADING PROPAEDEUTIC PROPAGANDISE PROPAGANDIZE PROPANEDIOIC PROTRACTEDLY PROTUBERATED PROUDHEARTED PROVIDENTIAL PRUDENTIALLY PRUSSIANISED PRUSSIANIZED PSEUDOGRAPHS PSEUDOGRAPHY PSEUDOMARTYR PSEUDORANDOM PSEUDOSCALAR PTERIDOMANIA PTERODACTYLE PTERODACTYLS PYRIDOXAMINE PYRITOHEDRAL QUADRAPLEGIA QUADRAPLEGIC QUADRICEPSES QUADRIPLEGIA QUADRIPLEGIC QUADRUPLEXED QUADRUPLEXES RADIOGRAPHED RADIOGRAPHER RADIOISOTOPE RADIOPHONIES RADIOSCOPIES RADIOTHERAPY READAPTATION REAPPARELLED RECIPROCATED REDEMPTIONAL REDISPLAYING REDUPLICATED REDUPLICATES REEMPHASISED REEMPHASIZED RELANDSCAPED RELANDSCAPES REPRIMANDING REPRIVATISED REPRIVATIZED REPROGRAMMED REPUDIATIONS REPUNCTUATED RESPONDENTIA RHABDOSPHERE RHODODAPHNES ROPEDANCINGS SANDPAPERIER SANDPAPERING SCOLOPENDRAS SCORPAENOIDS SCRAPERBOARD SHARECROPPED SHARPBENDERS SIDEROPENIAS SLIPSTREAMED SPARKPLUGGED SPATTERDOCKS SPEARHEADING SPEEDREADING SPERMATOCIDE SPERMATOZOID SPHEROIDALLY SPREADEAGLED SPREADSHEETS STAIRSTEPPED STANDPATTERS STENOGRAPHED STEPDAUGHTER STEWARDSHIPS SUBEPIDERMAL SUPERABOUNDS SUPERCHARGED SUPEREXALTED SUPERFETATED SUPERHARDENS SUPERMUNDANE SUPERORDINAL SUPERPRAISED SUPERSEDABLE SUPERSTARDOM SUPRAMUNDANE SWORDPLAYERS TEMPORALISED TEMPORALIZED THUNDERCLAPS TRADESPEOPLE TRADESPERSON TRANSPIERCED TRANSPLANTED TRANSPONDERS TRANSSHIPPED TRAPEZOHEDRA TREPIDACIOUS TREPIDATIONS TREPIDATIOUS TRIADELPHOUS TRICUSPIDATE TROPICALISED TROPICALIZED TRYPANOCIDES TRYPARSAMIDE UNAPPARELLED UNAPPROACHED UNCHAPERONED UNDERDAMPERS UNDERLAPPING UNDERPASSION UNDERPAYMENT UNDERPLANTED UNDERPLAYING UNDERPRAISED UNDERPRAISES UNDESPAIRING UNEXPURGATED UNPARALLELED UNPARDONABLE UNPATRONISED UNPATRONIZED UNPERFORATED UNPREPAREDLY UNPROCEDURAL UNPROCLAIMED UNPROGRAMMED UNREPROACHED UPWARDNESSES VIDEOGRAPHER WATERPROOFED