| Word | Derivatives/Forms |
| concede | conceded, concedes, conceding, concession, concessions |
| concept | concepts, conception, conceptions, conceptual, conceptually |
| concern | concerned, concerns, concerning, concern, unconcerned |
| conclude | concluded, concludes, concluding, conclusion, conclusions |
| condemn | condemned, condemns, condemning, condemnation |
| conduct | conducted, conducting, conducts, conduct, conductor, conductors |
| confer | conferred, confers, conferring, conference, conferences |
| confine | confined, confines, confining, confinement |
| confirm | confirmed, confirms, confirming, confirmation, confirmations |
| conflict | conflicted, conflicts, conflicting, conflict |
| confront | confronted, confronts, confronting, confrontation |
| confuse | confused, confuses, confusing, confusion, confusingly |
| connect | connected, connecting, connects, connection, connections, connective |
| consequence | consequence, consequences, consequent, consequently |
| conserve | conserved, conserves, conserving, conservation, conservator |
| consider | considerable, considerably, considerate, consideration, considered, considers, considering |
| consist | consistent, consistently, consisting, consists, inconsistency, inconsistent |
| constant | constantly, constancy, constants |
| constitute | constituted, constitutes, constituting, constitution, constitutional |
| construct | constructed, constructing, constructs, construction, constructions, constructive |
| consult | consulted, consults, consulting, consultation, consultant, consultants |
| consume | consumed, consumes, consuming, consumption, consumer, consumers |
| contact | contacted, contacting, contacts, contact |
| contain | contained, containing, contains, container, containers |
| contemplate | contemplated, contemplates, contemplating, contemplation |
| contemporary | contemporary, contemporaries |
| context | contexts, contextual |
| continue | continued, continues, continuing, continuation, continuously |
| contract | contracted, contracting, contracts, contract, contraction |
| contrast | contrasted, contrasts, contrasting, contrast, contrasting |
| contribute | contributed, contributes, contributing, contribution, contributions |
| contrive | contrived, contrives, contriving, contrivance |
| convene | convened, convenes, convening, convention, conventions |
| convention | conventions, conventional, conventionally |
| convert | converted, converts, converting, conversion |
| convince | convinced, convinces, convincing, conviction, convincingly |
| cooperate | cooperated, cooperates, cooperating, cooperation, cooperative |
| coordinate | coordinated, coordinates, coordinating, coordination, coordinator |
| core | cores |
| corporation | corporations, corporate |
| correspond | correspondence, corresponds, corresponding |
| corrupt | corrupted, corrupts, corrupting, corruption, corruptible |
| cost | costly, costs, costing |
| counsel | counselled, counsels, counselling, counsellor, counsellors |
| count | counted, counting, counts, countless |
| couple | coupled, couples, coupling |
| courage | courageous, courageously |
| course | courses |
| court | courts, courtesy |
| cover | covered, covering, covers, coverage, uncovered |
| create | created, creates, creating, creation, creations, creative, creatively, creator, creators |
| credit | credited, credits, crediting, credible, credibility, credentials |
| crew | crews |
| crime | crimes, criminal, criminals |
| criterion | criteria, criteriae (less common) |
| critic | critical, critically, criticism, criticize, criticized, criticizing, critics |
| crop | cropped, crops, cropping |
| crucial | crucially |
| cry | cried, cries, crying |
| culture | cultural, culturally, cultures |
| curious | curiously, curiosity |
| current | currently, currents |
| curve | curved, curves, curving |
| custom | customary, customs |
| cut | cutting, cuts |
| cycle | cycled, cycles, cycling |
| damage | damaged, damages, damaging |
| danger | dangerous, dangerously, endangered |
| data | datum (singular, less common) |
| date | dated, dates, dating |
| daughter | daughters |
| dawn | dawns |
| day | daily, days |
| dead | deadly, deaden, deadened, deadening, deadliness, deadliness |
| deal | dealt, dealing, deals |
| debate | debated, debates, debating, debate, debates |
| debt | debts |
| decade | decades, decadal |
| decline | declined, declines, declining, decline |
| dedicate | dedicated, dedicates, dedicating, dedication, dedicatory |
| deed | deeds |
| deem | deemed, deems, deeming |
| deep | deeply, deeper, deepest, depth, depths |
| defect | defective, defects, defecting, defection |
| define | defined, defines, defining, definition, definitions |
| degree | degrees |
| delay | delayed, delays, delaying, delay |
| delegate | delegated, delegates, delegating, delegation, delegate |
| deliver | delivered, delivers, delivering, delivery, deliveries |
| demand | demanded, demands, demanding, demand |
| demonstrate | demonstrated, demonstrates, demonstrating, demonstration, demonstrations |
| deny | denied, denies, denying, denial |
| depart | departed, departs, departing, departure, departures |
| depend | dependent, depending, depends, dependable, dependence |
| depict | depicted, depicts, depicting |
| deprive | deprived, deprives, depriving, deprivation |
| derive | derived, derives, deriving, derivation, derivative |
| describe | described, describes, describing, description, descriptions |
| desert | deserted, deserts, deserting, desert |
| deserve | deserved, deserves, deserving |
| design | designed, designates, designating, designation, designer, designers |
| desire | desired, desires, desiring, desire |
| despite | (N/A) |
| destroy | destroyed, destroys, destroying, destruction, destructive |
| detail | detailed, details, detailing, detail |
| detect | detected, detects, detecting, detection |
| determine | determined, determines, determining, determination |
| develop | developed, develops, developing, development, developments |
| deviate | deviated, deviates, deviating, deviation |
| device | devices |
| devote | devoted, devotes, devoting, devotion |
| diagram | diagrams |
| differ | difference, differences, different, differently, differs |
| difficult | difficulty, difficulties, difficulties |
| dig | dug, digs, digging |
| dimension | dimensions, dimensional |
| diminish | diminished, diminishes, diminishing |
| direct | directed, directing, direction, directions, directive, directly, director, directors |
| disagree | disagreed, disagrees, disagreeing, disagreement |
| disappear | disappeared, disappears, disappearing, disappearance |
| disclose | disclosed, discloses, disclosing, disclosure |
| discount | discounted, discounts, discounting, discount |
| discover | discovered, discovers, discovering, discovery, discoveries |
| discuss | discussed, discusses, discussing, discussion, discussions |
| disease | diseases, diseased |
| dismiss | dismissed, dismisses, dismissing, dismissal |
| display | displayed, displays, displaying, display |
| dispose | disposed, disposes, disposing, disposal, disposable |
| dispute | disputed, disputes, disputing, dispute |
| dissolve | dissolved, dissolves, dissolving |
| distance | distant, distances |
| distinct | distinction, distinctions, distinctly |
| distinguish | distinguished, distinguishes, distinguishing, distinction |
| distribute | distributed, distributes, distributing, distribution, distributive |
| diverse | diversity, diversely |
| divide | divided, divides, dividing, division, divisions |
| doctrine | doctrines, doctrinal |
| document | documented, documents, documenting, documentation |
| domestic | domestics |
| dominant | dominate, dominated, dominates, dominating, domination, predominantly |
| donate | donated, donates, donating, donation, donations |
| doubt | doubted, doubts, doubting, doubt |
| draw | drew, drawing, draws, drawn |
| dread | dreaded, dreads, dreading, dread |
| drive | drove, driven, driving, drives |
| drop | dropped, drops, dropping, drop |
| drought | droughts |
| due | duly |
| durable | duration, durations |
| during | (N/A) |
| duty | duties |
| dye | dyed, dyes, dyeing |
| dynamic | dynamically, dynamics |