2 letters:
oz

3 letters:
ahs, coz, gaz, mas, maz, pas, paz, roz, was

4 letters:
baas, baus, broz, cars, chas, daus, daws, diaz, droz, faas, faus, gaus, haws, ijaz, jaws, kaus, laas, laws, maas, maus, mroz, naas, naus, okaz, paws, saus, saws, sias, spas, vase, waas

5 letters:
achaz, afwas, ahsas, ahwaz, aldas, aspas, audas, belaz, blahs, capaz, cause, cefas, chaas, chaws, chazz, claas, claus, claws, cozze, craws, dagaz, dawes, deras, dma's, draus, draws, duraz, fawaz, flaws, fraas, fraus, galaz, gause, gauze, glaus, gnaws, hawes, hawse, i was, knaus, knyaz, lause, law's, lawes, lipas, llwas, maahs, namaz, papas, pause, plaas, praus, rajaz, sause, shahs, shaws, staas, tawas, tawes, tawse, thaws, tovaz, wah's

6 letters:
andaaz, anzaas, bedmas, brause, bylaws, claus', cs aas, danaus, degras, dupras, ecowas, eficaz, erilaz, fortaz, ha-has, haughs, helaas, heraus, he was, hinaus, inlaws, it was, kavkaz, lapras, la paz, macaws, manaus, meraas, mieras, mydaus, naoise, ocaw's, pachas, papa's, pilaus, prause, precoz, schwas, shah's, shaw's, shiraz, squabs, straws, tiswas, tripas

7 letters:
agelaus, aitraaz, anaspaz, applaus, bashaws, because, bindaas, by-laws, caspase, coultas, d'etats, firdaus, geegaws, genoise, guffaws, hamraaz, humraaz, hurrahs, in-laws, jigsaws, kadrmas, loblaws, lt gaas, mccaw's, mukhwas, omaha's, ottawas, outlaws, outlawz, panamas, pesewas, poitras, redraws, renoise, ripsaws, schnozz, seesaws, tijeras, vishwas, warsaws, waugh's, waxhaws

8 letters:
achimaas, applause, ashkenaz, backsaws, bandsaws, catalpas, catspaws, cervoise, cha-chas, choctaws, dewclaws, diapause, faux pas, forepaws, fretsaws, gauloise, grandmas, grandpas, hacksaws, handsaws, hima das, jackdaws, menelaus, morgause, naajayaz, nikolaas, outnoise, overawes, owlclaws, panama's, pontoise, quichuas, shanawas, that was, warsaw's, what was, whipsaws

9 letters:
aeropause, agesilaus, archelaus, arkansas', bedstraws, bradshaws, chainsaws, chaturmas, chippewas, crab-yaws, debevoise, francoise, ghettoise, grandma's, grandpa's, ionopause, kickshaws, laidlaw's, mackinaws, madrasahs, menopause, mesopause, mutafukaz, overdraws, overnoise, rickshaws, scofflaws, southpaws, speculaas, vlakplaas, wichita's, williwaws, withdraws

10 letters:
andropause, arcesilaus, arkansas's, bourgeoise, chickasaws, childermas, fassbrause, fritessaus, heliopause, interpause, jackstraws, joppiesaus, limbaugh's, mete gazoz, perlesvaus, portlaoise, pussy-paws, scrimshaws, tolochenaz, tropopause, val-d'oise

11 letters:
accessoires, aspidistras, escritoires, first cause, muslimgauze, pipsissewas, protesilaus, repertoires, santa claus, stratopause, vichyssoise, vladikavkaz

12 letters:
keeley hawes, laboratoires, magnetopause, premenopause

13 letters:
perimenopause, postmenopause, seine-et-oise, self-applause

14 letters:
cergy-pontoise, conservatoires, doctor of laws, master of laws, probable cause

15 letters:
auvers-sur-oise, dominique dawes

16 letters:
bachelor of laws, chrishell stause, de morgan's laws

17 letters:
beaumont-sur-oise

24 letters:
kirchhoff's circuit laws

28 letters:
equal protection of the laws