There are 691 words containing A, B and 2U, https://www.bestwordlist.com/c/a/4/wordswithabuu.htm
ABSQUATULATE ABSQUATULATED ABSQUATULATES ABSQUATULATING ACCUMULABLE
ACETABULUM ACETABULUMS ALBUGINEOUS ALBUMINOUS ALBUMINURIA ALBUMINURIAS
ALBUMINURIC ALBURNOUS ALBURNUM ALBURNUMS AMBIGUOUS AMBIGUOUSLY
AMBIGUOUSNESS AMBIGUOUSNESSES AMBULACRUM ANTITUBERCULAR ANTITUBERCULARS
ANTITUBERCULOUS ARBORICULTURAL ARBORICULTURE ARBORICULTURES ARBORICULTURIST
ARBUSCULAR ARBUTUS ARBUTUSES ARQUEBUS ARQUEBUSADE ARQUEBUSADES
ARQUEBUSES ARQUEBUSIER ARQUEBUSIERS ASSUBJUGATE ASSUBJUGATED
ASSUBJUGATES ASSUBJUGATING AUBURN AUBURNS AUCUBA AUCUBAS AUSUBO
AUSUBOS AUTOBUS AUTOBUSES AUTOBUSSES AUTOJUMBLE AUTOJUMBLES BACULOVIRUS
BACULOVIRUSES BACULUM BACULUMS BEAUCOUP BEAUCOUPS BEAUMONTAGUE
BEAUMONTAGUES BEAUTEOUS BEAUTEOUSLY BEAUTEOUSNESS BEAUTEOUSNESSES
BEAUTIFUL BEAUTIFULLER BEAUTIFULLEST BEAUTIFULLY BEAUTIFULNESS
BEAUTIFULNESSES BEAUTYBUSH BEAUTYBUSHES BETULACEOUS BIAURICULAR
BIAURICULATE BICULTURAL BICULTURALISM BICULTURALISMS BIOACCUMULATE
BIOACCUMULATED BIOACCUMULATES BIOACCUMULATING BIOACCUMULATION
BLAGUEUR BLAGUEURS BOURASQUE BOURASQUES BOUSOUKIA BOUZOUKIA BRACHIOSAURUS
BRACHIOSAURUSES BRACHYUROUS BRONTOSAURUS BRONTOSAURUSES BUCENTAUR
BUCENTAURS BUNRAKU BUNRAKUS BUNYAVIRUS BUNYAVIRUSES BUREAU BUREAUCRACIES
BUREAUCRACY BUREAUCRAT BUREAUCRATESE BUREAUCRATESES BUREAUCRATIC
BUREAUCRATISE BUREAUCRATISED BUREAUCRATISES BUREAUCRATISING BUREAUCRATISM
BUREAUCRATISMS BUREAUCRATIST BUREAUCRATISTS BUREAUCRATIZE BUREAUCRATIZED
BUREAUCRATIZES BUREAUCRATIZING BUREAUCRATS BUREAUS BUREAUX BURGLARIOUS
BURGLARIOUSLY BURRAMUNDI BURRAMUNDIS BURSERACEOUS BURSICULATE
BUSULFAN BUSULFANS BUTSUDAN BUTSUDANS BUTYRACEOUS BUZUKIA CARBUNCULAR
CIRCUMAMBAGIOUS CIRCUMAMBULATE CIRCUMAMBULATED CIRCUMAMBULATES
CIRCUMAMBULATOR CLUBHAUL CLUBHAULED CLUBHAULING CLUBHAULS COLUMBARIUM
COLUMBARIUMS CUBATURE CUBATURES CUBICULA CUCURBITACEOUS CUCURBITAL
CULTURABLE CUNABULA DAUNORUBICIN DAUNORUBICINS ELUCUBRATE ELUCUBRATED
ELUCUBRATES ELUCUBRATING ELUCUBRATION ELUCUBRATIONS EUBACTERIUM
EUPHORBIACEOUS EXALBUMINOUS FABULOUS FABULOUSLY FABULOUSNESS
FABULOUSNESSES FANTABULOUS FAUBOURG FAUBOURGS FAUXBOURDON FAUXBOURDONS
FUNAMBULATE FUNAMBULATED FUNAMBULATES FUNAMBULATING FUNAMBULATION
FUNAMBULATIONS FUNAMBULATOR FUNAMBULATORS FUNAMBULATORY FUNAMBULISM
FUNAMBULISMS FUNAMBULIST FUNAMBULISTS GUBERNACULA GUBERNACULAR
GUBERNACULUM HARBOURFUL HARBOURFULS HARQUEBUS HARQUEBUSE HARQUEBUSES
HARQUEBUSIER HARQUEBUSIERS HARQUEBUSS HARQUEBUSSES HIBERNACULUM
HOUSEHUSBAND HOUSEHUSBANDS HUMBUGGABLE INCUNABULA INCUNABULAR
INCUNABULIST INCUNABULISTS INCUNABULUM INFUNDIBULA INFUNDIBULAR
INFUNDIBULATE INSALUBRIOUS INSALUBRIOUSLY INSURMOUNTABLE INSURMOUNTABLY
INTERAMBULACRUM LABURNUM LABURNUMS LUCUBRATE LUCUBRATED LUCUBRATES
LUCUBRATING LUCUBRATION LUCUBRATIONS LUCUBRATOR LUCUBRATORS LUMBAGINOUS
MANUBRIUM MANUBRIUMS MANUFACTURABLE MICROTUBULAR MUCOMEMBRANOUS
MULTILOBULAR MULTILOBULATE NONAMBIGUOUS NUBECULA NUBECULAE NURTURABLE
OUTHARBOUR OUTHARBOURS PABULOUS PABULUM PABULUMS PLUMBAGINACEOUS
PLUMBAGINOUS PNEUMOBACILLUS PUNCTURABLE PURSUABLE RAMBUNCTIOUS
RAMBUNCTIOUSLY ROUNDABOUT ROUNDABOUTATION ROUNDABOUTED ROUNDABOUTEDLY
ROUNDABOUTILITY ROUNDABOUTING ROUNDABOUTLY ROUNDABOUTNESS ROUNDABOUTS
ROUSEABOUT ROUSEABOUTS ROUSTABOUT ROUSTABOUTS RUBIACEOUS RUMBUSTICAL
RUNABOUT RUNABOUTS RUPTURABLE SABULOUS SALUBRIOUS SALUBRIOUSLY
SALUBRIOUSNESS SCABERULOUS SIMAROUBACEOUS SIMARUBACEOUS SQUAWBUSH
SQUAWBUSHES SUBACUTE SUBACUTELY SUBADULT SUBADULTS SUBAFFLUENT
SUBANGULAR SUBAQUA SUBAQUATIC SUBAQUEOUS SUBARCUATE SUBARCUATION
SUBARCUATIONS SUBAUDIBLE SUBAUDIO SUBAUDITION SUBAUDITIONS SUBAURAL
SUBAURICULAR SUBBUREAU SUBBUREAUS SUBBUREAUX SUBCAPSULAR SUBCAUDAL
SUBCAUSE SUBCAUSES SUBCELLULAR SUBCLAUSE SUBCLAUSES SUBCLAVICULAR
SUBCORIACEOUS SUBCRUSTAL SUBCULTURAL SUBCULTURALLY SUBCURATIVE
SUBCUTANEOUS SUBCUTANEOUSLY SUBDEBUTANTE SUBDEBUTANTES SUBDUABLE
SUBDUABLY SUBDUAL SUBDUALS SUBDUPLICATE SUBDURAL SUBEQUAL SUBEQUATORIAL
SUBFACULTIES SUBFACULTY SUBFEUDATION SUBFEUDATIONS SUBFEUDATORY
SUBGLOBULAR SUBHUMAN SUBHUMANS SUBINFEUDATE SUBINFEUDATED SUBINFEUDATES
SUBINFEUDATING SUBINFEUDATION SUBINFEUDATIONS SUBINFEUDATORY
SUBINSINUATION SUBINSINUATIONS SUBITANEOUS SUBJUGABLE SUBJUGATE
SUBJUGATED SUBJUGATES SUBJUGATING SUBJUGATION SUBJUGATIONS SUBJUGATOR
SUBJUGATORS SUBLANGUAGE SUBLANGUAGES SUBLIEUTENANCY SUBLIEUTENANT
SUBLIEUTENANTS SUBLINGUAL SUBLITERATURE SUBLITERATURES SUBLUNAR
SUBLUNARY SUBLUNATE SUBLUXATE SUBLUXATED SUBLUXATES SUBLUXATING
SUBLUXATION SUBLUXATIONS SUBMANDIBULAR SUBMANDIBULARS SUBMINIATURE
SUBMINIATURES SUBMINIATURISE SUBMINIATURISED SUBMINIATURISES
SUBMINIATURIZE SUBMINIATURIZED SUBMINIATURIZES SUBMUCOSA SUBMUCOSAE
SUBMUCOSAL SUBMUCOSAS SUBNATURAL SUBNEURAL SUBNUCLEAR SUBOCULAR
SUBOPERCULA SUBOPERCULAR SUBORBICULAR SUBPOPULATION SUBPOPULATIONS
SUBSATURATED SUBSATURATION SUBSATURATIONS SUBSCAPULAR SUBSCAPULARS
SUBSEQUENTIAL SUBSPONTANEOUS SUBSTITUTABLE SUBSTITUTIONAL SUBSTITUTIONARY
SUBSTRATUM SUBSTRATUMS SUBSTRUCTURAL SUBSUMABLE SUBSURFACE SUBSURFACES
SUBTERNATURAL SUBTERRANEOUS SUBTERRANEOUSLY SUBTEXTUAL SUBTEXTUALLY
SUBTHERAPEUTIC SUBTITULAR SUBTREASURER SUBTREASURERS SUBTREASURIES
SUBTREASURY SUBTRIANGULAR SUBUCULA SUBUCULAS SUBULATE SUBUMBRELLA
SUBUMBRELLAR SUBUMBRELLAS SUBUNGULATE SUBUNGULATES SUBURBAN SUBURBANISATION
SUBURBANISE SUBURBANISED SUBURBANISES SUBURBANISING SUBURBANISM
SUBURBANISMS SUBURBANITE SUBURBANITES SUBURBANITIES SUBURBANITY
SUBURBANIZATION SUBURBANIZE SUBURBANIZED SUBURBANIZES SUBURBANIZING
SUBURBANS SUBURBIA SUBURBIAS SUBURBICARIAN SUBVISUAL SUCCOURABLE
SUCCUBA SUCCUBAE SUCCUBAS SUGARBUSH SUGARBUSHES SUPERABOUND SUPERABOUNDED
SUPERABOUNDING SUPERABOUNDS SUPERABUNDANCE SUPERABUNDANCES SUPERABUNDANT
SUPERABUNDANTLY SUPERAMBITIOUS SUPERANNUABLE SUPERBUREAUCRAT
SUPRAPUBIC SURMOUNTABLE SURREBUTTAL SURREBUTTALS SURTURBRAND
SURTURBRANDS TAUROBOLIUM TINTINNABULOUS TINTINNABULUM TRITUBERCULAR
TRITUBERCULATE TROUBADOUR TROUBADOURS TUBERACEOUS TUBERCULA TUBERCULAR
TUBERCULARLY TUBERCULARS TUBERCULATE TUBERCULATED TUBERCULATELY
TUBERCULATION TUBERCULATIONS TUBERCULISATION TUBERCULIZATION
TUBERCULOMA TUBERCULOMAS TUBERCULOMATA TUBOCURARINE TUBOCURARINES
TUBULAR TUBULARIAN TUBULARIANS TUBULARITIES TUBULARITY TUBULARLY
TUBULARS TUBULATE TUBULATED TUBULATES TUBULATING TUBULATION TUBULATIONS
TUBULATOR TUBULATORS TUBULATURE TUBULATURES TUBULIFLORAL TURBINACIOUS
TURBULATOR TURBULATORS TURNABOUT TURNABOUTS UBERSEXUAL UBERSEXUALS
UBIQUARIAN UBIQUITARIAN UBIQUITARIANISM UBIQUITARIANS UBIQUITARY
UBIQUITINATION UBIQUITINATIONS UMBELLULATE UMBRACULA UMBRACULATE
UMBRACULIFORM UMBRACULUM UMBRAGEOUS UMBRAGEOUSLY UMBRAGEOUSNESS
UMBRATILOUS UNABJURED UNABUSED UNABUSIVE UNACCOUNTABLE UNACCOUNTABLY
UNACCUSABLE UNACCUSABLY UNAMBIGUOUS UNAMBIGUOUSLY UNAMBITIOUS
UNAMBITIOUSLY UNAMUSABLE UNARGUABLE UNARGUABLY UNASSUAGEABLE
UNATTRIBUTABLE UNATTRIBUTABLY UNATTRIBUTED UNBASHFUL UNBEAUTIFUL
UNBEAUTIFULLY UNBOASTFUL UNBUDGEABLE UNBUDGEABLY UNBUILDABLE
UNBUREAUCRATIC UNBURNABLE UNCAPTURABLE UNCLUBABLE UNCLUBBABLE
UNCOMMUNICABLE UNCONQUERABLE UNCONQUERABLES UNCONQUERABLY UNCOUNTABLE
UNCRUSHABLE UNCULTIVABLE UNCULTIVATABLE UNCURABLE UNCURABLY UNCURBABLE
UNDAUNTABLE UNDEBAUCHED UNDISCUSSABLE UNDISGUISABLE UNDISPUTABLE
UNDISPUTABLY UNDOUBTABLE UNEDUCABLE UNENDURABLE UNENDURABLENESS
UNENDURABLY UNEQUABLE UNEQUITABLE UNEQUIVOCABLE UNEQUIVOCABLY
UNEXPUGNABLE UNFAVOURABLE UNFAVOURABLY UNFULFILLABLE UNGUESSABLE
UNHABITUATED UNHARBOUR UNHARBOURED UNHARBOURING UNHARBOURS UNHUSBANDED
UNILOBULAR UNIMPUGNABLE UNINSURABLE UNJUSTIFIABLE UNJUSTIFIABLY
UNLABORIOUS UNLABOURED UNLABOURING UNMEASURABLE UNMEASURABLY
UNPERSUADABLE UNPLAUSIBLE UNPLAUSIBLY UNPLEASURABLE UNPLEASURABLY
UNPROCURABLE UNPRONOUNCEABLE UNPUBLISHABLE UNPUNISHABLE UNPUNISHABLY
UNPURCHASABLE UNPURCHASEABLE UNPUTDOWNABLE UNQUALIFIABLE UNQUANTIFIABLE
UNQUANTIFIABLY UNQUENCHABLE UNQUENCHABLY UNQUESTIONABLE UNQUESTIONABLY
UNQUOTABLE UNRECAPTURABLE UNREPULSABLE UNRETURNABLE UNRETURNABLES
UNRUFFABLE UNSHUNNABLE UNSOUNDABLE UNSTATUTABLE UNSTATUTABLY
UNSTAUNCHABLE UNSUBDUABLE UNSUBLIMATED UNSUBSTANTIAL UNSUBSTANTIALLY
UNSUBSTANTIATED UNSUFFERABLE UNSUITABILITIES UNSUITABILITY UNSUITABLE
UNSUITABLENESS UNSUITABLY UNSUPPORTABLE UNSUPPOSABLE UNSURMOUNTABLE
UNSURPASSABLE UNSURPASSABLY UNSUSTAINABLE UNSUSTAINABLY UNTOUCHABILITY
UNTOUCHABLE UNTOUCHABLES UNTRANSMUTABLE UNTUNABLE UNTUNABLENESS
UNTUNABLENESSES UNTUNABLY UNTUNEABLE UNTURNABLE UNUSABLE UNUSABLY
UNUTTERABLE UNUTTERABLENESS UNUTTERABLES UNUTTERABLY UNVALUABLE
UNVANQUISHABLE UNVULNERABLE UNWOUNDABLE UPBUOYANCE UPBUOYANCES
USQUABAE USQUABAES USQUEBAE USQUEBAES USQUEBAUGH USQUEBAUGHS
USUCAPTIBLE VIBRACULARIUM VIBRACULUM