The shortest ones are die, doe, and due.
Four letter words include dale, dame, Dane, dare, date, daze,
dice, dike, dime, dine, dire, dive, dole, dome, done, dope, dose,
dote, dove, doze, dude, duke, dune, dupe, dyke, and dyne.
Five letter words are dance, delve, dense, deuce, Diane, dinge,
diode, dirge, Dixie, dodge, dogie, douse, drake, drape, drive,
drome, drone, drove, drupe, and dunce.
Six letter words are dabble, dacite, damage, dangle, Danube,
darkie, dative, dawdle, dazzle, debase, debate, Debbie, debone,
debtee, Denise, decade, decide, decode, decree, deduce, deface,
defame, defile, define, defuse, defuze, delete, degree, delude,
deluge, demise, demote, demure, Dengue, denote, denude, depose,
depute, deride, deride, derive, desire, detune, device, devise,
devote, Dianne, Diedre, dilate, dilute, dimple, dingle, dipole,
disuse, divide, divine, doable, docile, doggie, donate, dongle,
doodle, dosage, dotage, double, douche, dredge, drogue, drowse,
drudge, and duffle.
Seven letter words are debacle, datable, daytime, decease,
deceive, declare, decline, defense, deflate, degrade, Deirdre,
dejeune, delible, delouse, demerge, dentine, denture, deplane,
deplete, deplore, deprive, derange, descale, deserve, despise,
despite, devalue, deviate, devolve, devotee, diabase, dialyze,
dictate, diffuse, dinette, diocese, dioxide, disease, dislike,
dispose, dispute, disrobe, diverge, diverse, divorce, divulge,
dockage, doggone, draftee, drayage, dribble, drizzle, detente,
ductile, dunnage, durable, and dwindle.
Eight letter words are damnable, danseuse, database, datable,
dateline, declasse, deadline, decimate, decisive, decorate,
decouple, decrease, dedicate, defecate, definite, degrease,
deionize, Delaware, delegate, delicate, delusive, demonize,
denature, dendrite, deniable, denotate, denounce, depilate,
deportee, deputize, derisive, derriere, describe, desolate,
detainee, dethrone, detonate, deviance, dextrose, diagnose,
dialogue, diaspora, diatribe,digitize, disabuse, disagree,
disburse, disciple, disclose, discrete, disgorge, disgrace,
disguise, diskette, dislodge, dispense, disperse, displace,
disprove, dissolve, dissuade, distance, distaste, disunite,
disusage, disvalue, divisive, divorcée, dockside, doctrine,
doghouse, dolesome, dolomite, domicile, dominate, dopamine,
dormouse, downside, downsize, dragline, drainage, draisine,
Drambuie, drawable, dressage, driftage, drivable, dungaree,
dutiable, and dynamite.
Nine letter words are dalliance, débutante, déclassée,
deathlike, debatable, debenture, decadence, deceptive, decollate,
decompose, decoupage, deducible, deductive, defective, defensive,
deference, definable, defoliate, dehydrate, delineate, demagogue,
demarcate, demitasse, demurrage, denervate, denigrate, denotable,
deodorize, deoxidize, departure, depletive, deprecate, derisible,
desecrate, desiccate, designate, desirable, desperate, destitute,
detective, determine, devaluate, devastate, diatomite, diffusive,
digestive, diligence, diplomate, directive, dirigible, discharge,
discourse, disengage, disfigure, dislocate, dismantle, disparage,
disparate, displease, disrepute, dissemble, dissipate, dissolute,
divertive, divisible, doctorate, dogmatize, dollhouse, dominance,
doubtable, downgrade, downrange, downstage, downstate, drainpipe,
drainable, dramatize, dreamlike, drinkable, driveable, dubitable,
and duplicate.
Ten letter words are deactivate, debateable, debilitate,
debonnaire, decapitate, decathlete, deceivable, decelerate,
decimalize, decivilize, declarable, decolonize, decorative,
deductible, defeasance, defeasible, defendable, defensible,
deferrable, deficience, definitive, deflagrate, deflective,
deformable, defrayable, degenerate, degradable, dehumanize,
delaminate, delectable, deliberate, demandable, demobilize,
demodulate, demonetize, demoralize, demotivate, demurrable,
denominate, denotative, dentifrice, denunciate, dependable,
dependence, depletable, deplorable, depolarize, depopulate,
deprecable, depreciate, depressive, deregulate, derivative,
derogative, desalinate, desalinize, descramble, designable,
despicable, detachable, detectable, deterrence, detestable,
diamantine, dichromate, difference, diffidence, digestible,
digressive, dilapidate, dilettante, diminutive, disapprove,
disarrange, disbelieve, discipline, disclosure, discophile,
discourage, disentwine, disgruntle, dislikable, dismissive,
dispersive, disposable, disputable, disruptive, disservice,
dissidence, dissociate, dissoluble, dissonance, dissuasive,
distillate, distribute, disulphate, disulphide, divergence,
divertible, divestible, divulgence, downstroke, drawbridge, and
Dumbledore.
Eleven letter words are decarbonize, declarative, decrepitude,
deemphasize, delineative, deliverable, deliverance, demagnetize,
democratize, demonstrate, deoxygenate, deoxyribose, deprecative,
describable, descriptive, desegregate, desensitize, designative,
despondence, destabilize, destructive, deteriorate, diffractive,
directorate, disassemble, discernible, discontinue, discotheque,
disentangle, disenthrone, disguisable, disorganize, dispensable,
displeasure, disquietude, dissectible, disseminate, dissolvable,
distensible, distillable, distinctive, distractive, disturbance,
divestiture, doctrinaire, dodecastyle, domesticate, domesticize,
and duplicative.
Twelve letter words are dearticulate, debilitative,
decaffeinate, decentralize, decipherable, defenestrate,
degenerative, demilitarize, demineralize, demonstrable,
depoliticize, depolymerize, depreciative, depressurize,
determinable, diminishable, disaccharide, disadvantage,
disadventure, disagreeable, disallowable, disallowance,
disassociate, discomfiture, disconsolate, discountable,
discriminate, disfranchise, dishonorable, disincentive,
disintegrate, disobedience, disreputable, dissemblance,
dissertative, dissocialize, dissociative, and distributive.
Thirteen letter words are daguerreotype, decompressive,
decontaminate, decriminalize, dematerialize, demonstrative,
depersonalize, determinative, differentiate, disappearance,
disarticulate, discreditable, dispassionate, distributable, and
diversifiable.
Fourteen letter words are dinoflagellate, disaccommodate,
discombobulate, discontinuance, discriminative, disencumbrance,
disenfranchise, disincorporate, disinvestiture, and
disqualifiable.
Fifteen letter words are deindustrialize, departmentalize,
dimethylaniline, and distinguishable.
A sixteen letter word is disproportionate.
A seventeen letter word is dextroamphetamine.
(There are no larger non-chemical words, but at 21 letters are
the phrases dishonorable discharge and distinguishing feature.)