15 letters
- circumnavigator32
- circumscription32
- circumspections32
- circumstantiate26
- circumvallating34
- circumvallation32
- circumvolutions32
- citriculturists24
- civilianization34
- clamorousnesses24
- clandestineness23
- clandestinities22
- classifications26
- classlessnesses21
- claustrophobias28
- clearheadedness24
- cleistogamously28
- cloudlessnesses23
- coagulabilities26
- codetermination24
- codifiabilities26
- coeducationally28
- coenzymatically40
- coinvestigators25
- coldheartedness24
- collaboratively30
- collateralities21
- collateralizing33
- collectednesses25
- collenchymatous32
- colloquialities31
- colonizationist30
- colorfastnesses23
- colorlessnesses21
- combativenesses29
- combinatorially29
- comfortableness29
- commemoratively34
- commensurations27
- commercialising31
- commercialistic31
- commercialities28
- commercializing40
- commiseratingly30
- commissionaires25
- commodification32
- commonplaceness33
- communicability35
- communicational31
- communicatively36
- communistically33
- commutativities29
- comparabilities28
- comparativeness29
- compassionately28
- compassionating28
- compatibilities28
- compendiousness28
- competitiveness29
- complementaries29
- complementarily32
- complementarity31
- complementation30
- complementizers38
- complicatedness30
- complimentarily32
- compositionally29
- comprehensively34
- compressibility30
- comptrollership31
- computabilities29
- computationally30
- computerization35
- computerphobias33
- comradelinesses24
- conceitednesses24
- conceivableness31
- concelebrations27
- concentricities26
- conceptualising30
- conceptualistic30
- conceptualities27
- conceptualizers36
- conceptualizing39
- concertednesses24
- concertmeisters25
- concessionaires23
- concretizations32
- condescendences29
- condescendingly31
- conducivenesses29
- confectionaries26
- confectioneries26
- confessionalism27
- confessionalist24
- confidentiality27
- confidingnesses27
- configurational27
- confirmednesses27
- confraternities23
- confrontational25
- conglomerateurs26
- conglomerations26
- conglutinations25
- congratulations24
- congressionally26
- congresspersons25
- congruousnesses24
- conjugatenesses32
- conjugationally36
- conjunctionally38
- connaturalities22
- connectednesses25
- connoisseurship26
- consanguinities24
- conscientiously27
- consciousnesses24
- consecutiveness28
- consentaneously25
- consequentially34
- conservationist24
- conservatorship28
- considerateness21
- conspicuousness28
- constitutionals22
- constructionist24
- constructivisms30
- constructivists27
- consultantships27
- containerboards24
- contemplatively33
- contemporaneity28
- contemporaneous27
- contemptibility31
- contentednesses22
- contentiousness22
- contextualizing40
- contortionistic23
- contractibility28
- contractilities23
- contradictories23
- contradictorily26
- contraindicated25
- contraindicates24
- contrapositions23
- contrapositives26
- controllability27
- controllerships26
- controversially27
- conventionalism29
- conventionalist26
- conventionality28
- conventionalize35
- convertibleness28
- conveyorization35
- cooperationists22
- cooperativeness26
- corporealnesses23
- correspondences27
- correspondingly29
- corrigibilities24
- corrosivenesses23
- corticosteroids22
- corticosterones22
- corticotrophins27
- corynebacterial28
- corynebacterium31
- cosmopolitanism29
- cotransductions25
- coulometrically30
- councillorships30
- counterargument27
- counterassaults22
- counterattacked28
- counterattacker27
- counterbalanced29
- counterbalances28
- counterblockade32
- countercampaign32
- counterchanging31
- countercharging30
- counterchecking35
- counterclaiming30
- countercultural27
- countercultures26
- countercurrents25
- countercyclical33
- counterevidence29
- counterexamples34
- counterguerilla25
- counterinstance25
- counterirritant21
- countermarching31
- countermeasures24
- countermelodies25
- countermovement31
- counterordering24
- counterpetition24
- counterpicketed31
- counterplotting27