13 letters
- architectural23
- architectures22
- aristocracies19
- arithmetician22
- aromaticities19
- arthritically22
- arthroscopies21
- articulations19
- artificiality22
- ascertainable21
- ascertainment21
- associateship21
- associational18
- associatively23
- associativity22
- asthmatically25
- astringencies20
- astrocytomata21
- astronautical19
- astrophysical24
- asynchronisms25
- asyndetically24
- atavistically24
- atheistically22
- atomistically23
- atrociousness18
- attractancies20
- atypicalities22
- audaciousness20
- audiocassette18
- auscultations20
- autecological24
- authentically24
- authenticated21
- authenticates20
- authenticator20
- autocatalyses20
- autocatalysis20
- autocatalytic23
- autocephalies23
- autocephalous24
- autochthonous23
- autoeroticism20
- autoinfection22
- automatically24
- autonomically25
- aviculturists23
- avocationally25
- axiologically30
- axiomatically30
- baccalaureate24
- bacchanalians27
- bachelorettes22
- bachelorhoods25
- backcountries28
- backgrounders28
- backgrounding31
- backpedalling32
- backscattered27
- backstabbings32
- backstitching31
- backstretches28
- bacteriologic25
- bacteriolyses22
- bacteriolysis22
- bacteriolytic25
- bacteriophage26
- bacteriophagy28
- bacteriostats19
- bacterization29
- ballistically25
- barefacedness24
- baroreceptors22
- basidiomycete25
- basifications23
- bathymetrical27
- beatification23
- behavioristic25
- bellicosities21
- belligerences24
- benchmarkings32
- beneficiaries23
- beneficiating26
- beneficiation24
- bibliographic30
- bibliomaniacs27
- bicameralisms26
- bicentenaries21
- bicentennials23
- biconcavities27
- biconditional23
- biconvexities31
- biculturalism26
- bidirectional22
- bimetallistic24
- bimolecularly28
- bioactivities23
- biochemically31
- biocompatible29
- bioconversion25
- bioelectrical24
- bioenergetics22
- biogeographic28
- biomechanical29
- biometricians23
- biophysicists26
- bioscientific26
- bioscientists20
- biostatistics19
- biosystematic24
- biotechnology27
- biotelemetric23
- birefringence26
- bisectionally24
- blackguarding31
- blackguardism31
- blacksmithing32
- blastomycoses25
- blastomycosis25
- blockbustings31
- bloodcurdling27
- bluestockings28
- bombastically29
- bonnyclabbers30
- borosilicates20
- bottlenecking28
- brachycephaly34
- brachypterous27
- brainchildren25
- breechloaders23
- bromocriptine26
- bronchoscopes28
- bronchoscopic31
- bronchospasms28
- broncobusters24
- bureaucracies24
- bureaucratese21
- bureaucratise21
- bureaucratism24
- bureaucratize30
- cabinetmakers27
- cabinetmaking30
- cachinnations24
- cacographical30
- cacophonously29
- caddishnesses21
- calcification27
- calculatingly28
- calculational24
- calefactories23
- calligraphers25
- calligraphies25
- calligraphist25
- callithumpian28
- callousnesses20
- calorimetries20
- calumniations23
- camerapersons23
- campanologies26
- campanologist26
- camphoraceous28
- campylobacter31
- canalizations28
- cancellations23
- candleberries22
- candleholders23
- candlelighted25
- candlelighter24
- candlesnuffer27
- cannibalising25
- cannibalistic25
- cannibalizing34
- cannonballing27
- canonizations28
- canthaxanthin30
- cantilevering25
- cantillations20
- capablenesses24
- capaciousness24
- capacitations23
- capercaillies24
- capercailzies32
- capillarities21
- capitulations22
- caprification26
- caravansaries21
- caravanserais21
- carbohydrases24
- carbohydrates24
- carboniferous24
- carbonization30
- carbonylation24
- carboxylating32
- carboxylation30
- carburization30
- carcinomatous24
- cardinalities19
- cardinalships24
- cardiographic27
- cardiological24