4 letters:
best, dest, este, fest, gest, jest, lest, mest, nest, pest, rest, test, vest, west, yest, zest

5 letters:
-rest, beste, blest, brest, ceste, chest, crest, deste, drest, feste, flest, geste, guest, leste, neste, peste, prest, quest, reste, teste, trest, veste, weste, wrest, yoest, zeste

6 letters:
aleste, angest, arrest, arzest, asbest, ateste, attest, behest, breast, breste, celest, cessed, chesed, chrest, cresst, detest, devest, digest, divest, f-test, fessed, g-test, incest, infest, ingest, invest, jessed, messed, molest, queste, retest, threst, unrest, v-test, yessed, z-test

7 letters:
abreast, acquest, addrest, addwest, agreste, altfest, anapest, armrest, av-test, bedrest, bequest, blessed, canwest, celeste, charest, confest, congest, contest, dressed, farwest, ferrest, funeste, funfest, guessed, hamfest, increst, inquest, magfest, midwest, modeste, natwest, norwest, outfest, penwest, pressed, pretest, protest, request, segrest, sinfest, skywest, sudeste, suggest, sylvest, threste, tressed, trivest, unblest

8 letters:
accessed, alcahest, alcotest, alkahest, anapaest, arbalest, assessed, backrest, bankwest, bookrest, bud-test, budapest, bukarest, caressed, carquest, conteste, d'allest, demarest, egressed, elfquest, excessed, finessed, finevest, flyquest, headrest, humanest, indigest, knotfest, low-test, manafest, manifest, mapquest, marquest, moogfest, obsessed, opaquest, outwrest, pre-test, proquest, quiesced, rearrest, recessed, redigest, reinvest, sealtest, seaquest, slugfest, songfest, stressed, sub-test, techfest, telewest, unbreast, webquest

9 letters:
abscessed, addressed, adpressed, aggressed, appressed, beta-test, bucharest, coalesced, confessed, dataquest, decongest, depressed, dienogest, digressed, disinfest, disinvest, east-west, evanesced, everquest, expressed, fininvest, firecrest, goldcrest, grundfest, hartebest, heroquest, high-test, holmquest, hyndreste, impressed, indigeste, intrawest, jeanswest, mechquest, megaquest, metinvest, newsquest, obssessed, opalesced, oppressed, outbreast, overwrest, possessed, precessed, predigest, professed, redbreast, redressed, regressed, repressed, rhymefest, road-test, runequest, saw-wrest, self-test, snappiest, southwest, tageteste, telequest, tool-rest, transvest, turnwrest, unblessed, undervest, undressed, unguessed, unpressed, volksfest, woodcrest

10 letters:
acquiesced, alpha-test, blood-test, bluebreast, circumvest, compressed, crash-test, distressed, envirotest, field-test, fieldcrest, fluoresced, hammerfest, healthvest, hotpressed, immanifest, intumesced, luminesced, means-test, nape-crest, north-west, obsolesced, outguessed, progressed, reassessed, ridgecrest, seedinvest, south-west, stateswest, summerfest, suppressed, swordquest, unassessed, undercrest, unstressed

11 letters:
all-dressed, autosuggest, breath-test, convalesced, defervesced, deliquesced, disneyquest, dragonquest, effervesced, effloresced, flight-test, galley-west, grosseteste, hardpressed, harmonquest, ill-dressed, octoberfest, oktoberfest, overdressed, prestressed, readdressed, repossessed, saengerfest, screen-test, self-arrest, silvercrest, timor-leste, top-dressed, unaddressed, unconfessed, underinvest, unexpressed, unimpressed, unpossessed, unprocessed, unprofessed, unredressed, unrepressed

12 letters:
browserquest, decompressed, dispossessed, eastern-west, hard-pressed, house-arrest, lese-majeste, misaddressed, monsterquest, obcompressed, overstressed, prepossessed, retrogressed, transgressed, uncompressed, underdressed, unsuppressed, velvetbreast, well-dressed

13 letters:
all-possessed, bench-pressed, cross-dressed, forepossessed, haverfordwest, phosphoresced, self-interest, self-obsessed, subcompressed

14 letters:
adventurequest, chimney-breast, counterprotest, hammer-dressed, sackville-west, second-guessed, self-addressed, self-confessed, self-possessed, self-professed, unprepossessed, west-northwest, west-southwest, xmlhttprequest

15 letters:
north-northwest, south-southwest

16 letters:
immunosuppressed

4 letters:
left, deft, heft

5 letters:
cleft, theft

6 letters:
bereft, meshed

8 letters:
enmeshed, wreathed

9 letters:
refreshed

11 letters:
intermeshed, unrefreshed