4 letters:
botz, cots, dots, gotz, hots, kotz, lats, lots, lotz, mots, motz, nots, notz, otts, pots, rots, rotz, tots, watz

5 letters:
amotz, baatz, bahts, bautz, blots, botts, clots, dotts, duats, frotz, ghats, gotts, grots, grotz, iatse, kaatz, kautz, khats, klotz, knots, krotz, lot's, lotse, lotts, mautz, motse, motts, naats, nobts, notts, pautz, phots, plots, plotz, pot's, potts, protz, psats, quats, raatz, scots, shatz, shots, slots, snots, spots, stots, stotz, swats, trots, trotz, twats, watts

6 letters:
allots, ascots, aughts, bottes, braatz, budots, capots, croats, crotts, ersatz, gobots, inwats, knotts, kraatz, lhotse, lottes, mott's, mottes, oughts, plaats, plautz, plotts, repots, robots, scotts, shotts, spaatz, spotts, squats, staats, stotts, watt's, xybots, yachts

7 letters:
ablauts, aragats, barotse, buryats, croat's, despots, hotpots, inkpots, knott's, loquats, maniots, mascots, naughts, noughts, ocelots, robot's, sadat's, scott's, sexpots, spadats, squatts, surat's, teapots, unknots, upshots, vorsatz, zarautz

8 letters:
apricots, autobots, bibelots, boombots, bowknots, bowshots, boycotts, camazotz, camelots, cocottes, cypriots, dashpots, dogtrots, dovecots, eudicots, eyespots, faught's, feedlots, fusspots, garottes, gunshots, haricots, hotshots, hotspots, inkblots, jackpots, labatt's, melilots, monocots, mugshots, nanobots, ocelot's, oviatt's, potshots, sandlots, schott's, sunspots, talipots, thoughts, topknots, tosspots, whatnots, woodlots, wyandots

9 letters:
advocaats, aeronauts, aquanauts, argonauts, berlottes, cachalots, cachepots, carrycots, crackpots, entrepots, fleshpots, foreshots, gallipots, gigawatts, have-nots, headshots, honeypots, hot-shots, huguenots, kilowatts, mailshots, megawatts, microdots, slapshots, slipknots, snapshots, stinkpots, stockpots, storybots, tsunkatse, xenonauts

10 letters:
aeroflot's, argonaut's, argonautes, astronauts, battlebots, coffeepots, concordats, cosmonauts, cybernauts, flesh-pots, flowerpots, juggaknots, micronauts, microwatts, milliwatts, nightspots, onslaughts, slingshots, taikonauts, turcotte's

11 letters:
anastigmats, astronaut's, astronauts', cosmonauts', cyphonautes, hanseyachts, irish-scots, juggernauts, policenauts, psychonauts, screenshots

12 letters:
awesomenauts, casting lots, drawing lots, dreadnaughts, dreadnoughts, forethoughts

13 letters:
afterthoughts, scribblenauts, slaughterbots

14 letters:
forget-me-nots

16 letters:
marvel one-shots

22 letters:
in everyone's thoughts

23 letters:
list of olympic mascots

25 letters:
list of apollo astronauts

2 letters:
os

3 letters:
kos, bos, las

4 letters:
boss, ross

5 letters:
hamas, floss, fosse, klaas

6 letters:
alsace, crosse

7 letters:
bugloss

8 letters:
terrasse

9 letters:
semigloss, demitasse, genus bos

10 letters:
straw boss, betsy ross, candyfloss, party boss, trail boss

12 letters:
dental floss

14 letters:
political boss

18 letters:
betsy griscom ross