1 syllable:
's, -esce, bess, besse, bless, blesse, bress, bresse, cesce, cesse, ches, chess, cress, dress, es, ess, esse, fess, fesse, gess, gesse, ghess, gless, gress, guess, hess, hesse, jess, kess, kless, kness, kress, kresse, les, less, lesse, mess, messe, nes, ness, nesse, pesce, pless, press, press', presse, ques, ress, s, s., spece, stress, tess, tress, tresse, vess, wes, wess, yes

2 syllables:
.htaccess, abaisse, abbess, abbesse, abscess, accresce, acess, address, adpress, adress, aggress, altesse, ancress, apress, assess, attests, balldress, bench-press, benchpress, cabesse, caress, cimpress, citess, coatdress, compesce, compress, concresce, confess, contests, cross-dress, depress, digests, digress, distress, dock-cress, e-dress, eddress, egress, eldress, ellesse, etess, excess, express, express', eyedress, factoress, faiblesse, favoress, fidesz, finesse, fluoresce, forbess, frondesce, full-dress, goldress, harpress, head-dress, headdress, headress, hot-press, hotpress, htaccess, humblesse, idlesse, impress, ines, keypress, kubes, l'express, largesse, ls, lutece, lyness, murdress, newsless, nightdress, nobless, noblesse, obsess, oppress, outguess, p-process, pantdress, pavesse, payless, portesse, possess, precess, process, profess, progress, protests, pultesse, putresce, quarkxpress, quiesce, r-process, re-dress, re-press, recess, redress, regress, relesse, repress, requests, rhine-hesse, rockcress, s'express, s-process, secess, senesce, shirtdress, side-dress, siese, simplesse, slipdress, songless, souplesse, stonecress, success, suppress, tenesse, top-dress, topdress, transgress, ts, tumesce, unbless, undress, unless, vanfess, vanjess, veilless, wardress, waveless, wordpress, wrongless

3 syllables:
abcess, abs, acquiesce, adolesce, aeropress, anchoress, authoress, bankeress, battle-dress, battledress, bittercress, bodiless, cafepress, cateress, cbs, ccs, charmeress, chideress, ciderpress, coalesce, conqueress, contactless, convalesce, cps, danceress, de-access, decompress, defervesce, deliquesce, detumesce, dispossess, disprofess, doctoress, dss, echoless, effervesce, effloresce, electoress, emperess, evanesce, faithfulness, fancy-dress, farmeress, fool-largesse, forteresse, fr-sscs, fruiteress, gentilesse, gps, heathenesse, housedress, hp-42s, iexpress, incandesce, insuccess, intrudress, intumesce, inverness, iridesce, irs, juggleress, latinesce, lawyeress, lcs, letterpress, linen-press, luminesce, maladdress, mayoress, minidress, minipress, minoress, misaddress, misprofess, missuccess, murderess, naileress, natheless, netaddress, nonetheless, oas, obsolesce, opalesce, ostleress, overdress, overpress, pennycress, peppercress, phosphoresce, politesse, prepossess, rafas, rascaless, re-address, reaccess, readdress, reassess, recalesce, recrudesce, refenes, reimpress, reinvests, repossess, retrogress, rivaless, romanes, satrapess, savioress, scatheless, scs, secondguess, self-access, singeress, sinneress, sms, soldieress, sorceress, sos, sowdanesse, subaddress, subprocess, sunexpress, tailoress, thinkprogress, traitoress, treasuress, tutoress, underdress, unpossess, unsuccess, uss, vnexpress, waileress, warrioress, watercress, what-a-mess, win32s, window-dress, winepress, winter-cress, word-process

4 syllables:
abts, adss, adulteress, adventuress, aeroexpress, agendaless, aliexpress, anchoritess, avengeress, bioprocess, cdnjs, cfexpress, cmos, decipheress, delicatesse, delikatesse, direct-access, embroideress, hces, hyperaccess, inertialess, microabscess, multiaccess, napss, neertheless, nevertheless, overassess, overexpress, permanent-press, pinkpantheress, pizzaexpress, random-access, rejuvenesce, stds, tcas, turboexpress, umbrellaless, work-in-progress, ws

5 syllables:
ccass, csrss, dmlss, dpnss, gulp.js, icbms, internunciess, ivchenko-progress, pcass, pccts, regional-express, rsvps, superioress, tacacs, zexcs

6 syllables:
intercity-express, ssssss, viacomcbs

7 syllables:
sssssss

8 syllables:
libdvdcss