15 letters
- complementation30
- complementizers38
- compositionally29
- computabilities29
- computationally30
- computerization35
- concelebrations27
- concentricities26
- conceptualistic30
- conceptualities27
- concretizations32
- confectionaries26
- confectioneries26
- confidentiality27
- configurational27
- confraternities23
- confrontational25
- conglomerations26
- conglutinations25
- congratulations24
- conjugationally36
- conjunctionally38
- connaturalities22
- consanguinities24
- conscientiously27
- consecutiveness28
- consequentially34
- conservationist24
- constitutionals22
- constructionist24
- constructivisms30
- constructivists27
- contemplatively33
- contemptibility31
- contentiousness22
- contortionistic23
- contractibility28
- contractilities23
- contrapositions23
- contrapositives26
- conventionalism29
- conventionalist26
- conventionality28
- conventionalize35
- convertibleness28
- conveyorization35
- cooperationists22
- cooperativeness26
- corrigibilities24
- corticosteroids22
- corticosterones22
- corticotrophins27
- cotransductions25
- counterpetition24
- counterplotting27
- counterpointing27
- counterquestion31
- counterreaction24
- creditabilities23
- criminalization33
- crosslinguistic26
- crotchetinesses24
- cryptanalytical31
- crystallinities23
- crystallization32
- cultivabilities28
- cyanoethylating29
- cyanoethylation27
- cytogenetically30
- cytogeneticists26
- damageabilities25
- deacidification27
- decaffeinations27
- decalcification30
- decarboxylating35
- decarboxylation33
- decarburization33
- decasualization31
- deceptivenesses27
- decertification26
- dechlorinations24
- decimalizations33
- decolonizations31
- decolorizations30
- decompensations27
- deconcentrating27
- deconcentration25
- deconsecrations24
- deconstructions25
- decontaminating27
- decontamination25
- dedifferentiate24
- deductibilities25
- defeasibilities23
- defectivenesses27
- defeminizations33
- defenestrations21
- defensibilities24
- defibrillations25
- deglamorization32
- dehumanizations33
- dehydrogenating27
- dehydrogenation25
- delectabilities24
- delegitimations23
- delocalizations31
- demagnetization32
- demobilizations33
- democratization32
- demonetizations30
- demonstrational22
- demonstratively27
- demoralizations30
- demystification28
- denationalizing31
- denazifications33
- denitrification24
- dependabilities25
- depigmentations26
- depolarizations30
- derivatizations30
- desacralization30
- desalinizations28
- descriptiveness27
- desensitization27
- desertification23
- desexualization35
- destabilization30
- destitutenesses18
- destructibility26
- destructionists21
- destructiveness25
- destructivities24
- desulfurization32
- detachabilities25
- detectabilities23
- deterrabilities20
- detoxifications30
- detribalization30
- devitrification27
- diagonalization30
- dichotomization34
- differentiating26
- differentiation24
- digestibilities22
- digitalizations29
- disaffiliations24
- disaggregations23
- disambiguations26
- disappointingly29
- disapprobations26
- disarticulating24
- disarticulation22
- disassociations20
- disconcertingly29
- disconformities26
- disconsolations22
- discontinuances26
- discontinuation23
- discontinuities22
- discontinuously26
- discriminations24
- disembarkations27
- disenchantingly29
- disinclinations23
- disinfestations21
- disinflationary24
- disinformations24
- disintegrations20
- disintoxicating30
- disintoxication28
- disorganization29
- disorientations18
- disposabilities23
- disproportional24
- disproportioned24
- dissatisfaction23
- dissatisfactory24
- dissimilarities20
- distinctiveness25
- distinguishable26
- distinguishably28
- distractibility25
- diversification27
- divertissements24
- documentational26
- dolomitizations30
- dyslogistically28
- ecclesiasticism28
- educationalists22
- effectivenesses29
- egocentricities24
- electrification26
- electroacoustic26
- electrodialytic26
- electrokinetics27
- electromagnetic28
- electronegative26
- electrophoretic27
- electropositive26