Mammoth Uncensored Word List:
30 words that are 20 letters long beginning with c in the mammoth uncensored word list.

chemicophysiological chemicophysiologists chemoautotrophically chemostratigraphists chemotherapeutically chemotherapeuticness chlorofluoromethanes cholecystnephrostomy chronostratigraphers chronostratigraphics chronostratigraphist compartmentalisation compartmentalization comprehensiblenesses contradistinguishing conventionalizations counterconditionings counterdemonstrating counterdemonstration counterdemonstrators counterintelligences counterintuitiveness countermobilizations counterrevolutionary countersurveillances countertransferences crystallographically crystalloluminescent cyclostratigraphists cytodifferentiations