4 letters:
gown, lown, noun, town

5 letters:
adown, brown, chown, clown, crown, down-, downe, drown, frown, kauan, kaun?, shoun, towne

6 letters:
a-town, adnoun, around, b-town, browne, bytown, c-town, crowne, d-town, godown, intown, k-town, mccoun, mccown, mcgown, motown, mytown, o-town, oughne, oynoun, p-town, pynoun, renown, resoun, s-town, ungown, uptown

7 letters:
anytown, ashdown, baytown, bedgown, boytown, buydown, chitown, cowtown, cutdown, decrown, dogtown, embrown, gastown, go-down, hoedown, hogtown, imbrown, j-crown, laydown, letdown, lowdown, mcquown, midtown, miltown, mixdown, naptown, newtown, patdown, paydown, putdown, rubdown, rundown, runtown, sandown, seatown, setdown, simtown, sitdown, sundown, teltown, toytown, uncrown, wigtown

8 letters:
assclown, backdown, ballgown, beantown, beardown, beatdown, bestrown, blowdown, bluegown, bonetown, boomtown, boystown, bro'town, busytown, buy-down, capetown, comedown, cooldown, cramdown, discrown, downtown, drawdown, dropdown, dufftown, facedown, ferndown, foodtown, freetown, greytown, holddown, holetown, hometown, kickdown, kutztown, lazytown, let-down, lie-down, limetown, lockdown, longtown, lookdown, low-down, markdown, meltdown, milltown, newtowne, nutbrown, one-down, overtown, pat-down, pay-down, piltdown, pinetown, playdown, pulldown, pushdown, put-down, rub-down, run-down, sandtown, showdown, shutdown, sit-down, slowdown, takedown, teardown, tie-down, top-down, turndown, upsidown, upsodown, washdown, westtown, yaletown, yorktown

9 letters:
adamstown, allentown, bankstown, bardstown, blacktown, blastdown, bravetown, breakdown, bringdown, browntown, bunnytown, cape-town, chinatown, clampdown, climbdown, closedown, colquhoun, come-down, cookstown, countdown, crackdown, crosstown, diggstown, drop-down, eatontown, eiderdown, face-down, fold-down, funkytown, ghoultown, greektown, greentown, hack-down, hadestown, hand-down, hillsdown, hold-down, hull-down, jamestown, japantown, jefftowne, johnstown, jollitown, kick-down, kingstown, knockdown, koreatown, lansdowne, levittown, lewistown, lock-down, look-down, lordstown, nightgown, nut-brown, overdrown, pastedown, phasedown, pottstown, pull-down, runaround, shakedown, shinedown, shootdown, shut-down, smackdown, smalltown, smithtown, southdown, spelldown, standdown, steeltown, step-down, swansdown, swingtown, take-down, tarrytown, tear-down, throwdown, touchdown, tracktown, underdown, undergown, urinetown, watertown, wind-down, writedown

10 letters:
abbotstown, africatown, allhallown, austintown, beardstown, bordentown, bridgetown, brownstown, buff-brown, build-down, climb-down, close-down, count-down, cross-town, dallastown, dark-brown, dragontown, frenchtown, georgetown, germantown, gray-brown, grey-brown, hagerstown, hair-brown, half-crown, hands-down, harmontown, hightstown, knock-down, lennoxtown, marrybrown, middletown, moorestown, morgantown, morristown, norristown, paramount+, playground, princetown, queenstown, right-down, rust-brown, seal-brown, shantytown, shoot-down, silvertown, small-town, splashdown, stand-down, steep-down, summertown, swans-down, thomastown, throw-down, tinseltown, touch-down, trenchtown, tumbledown, upsidedown, walkertown, write-down, youngstown

11 letters:
3blue1brown, abbottstown, bandsintown, belchertown, boiled-down, broken-down, brown-brown, button-down, cabbagetown, campbeltown, charlestown, cooperstown, downingtown, dumbed-down, embassytown, francistown, grahamstown, handed-down, milliontown, mummy-brown, olive-brown, out-of-town, pegged-down, randalstown, rusty-brown, scaled-down, snuff-brown, stanleytown, tawny-brown, thistledown, thumbs-down, trickledown, tumble-down, up-and-down, upside-down, whiskeytown, whity-brown

12 letters:
campbelltown, copple-crown, golden-brown, hackettstown, half-a-crown, hand-me-down, marshalltown, orange-brown, provincetown, purple-brown, trickle-down, triple-crown, watered-down, williamstown, yellow-brown

13 letters:
buttoned-down, charlottetown, chukker-brown, dressing-down, elizabethtown, multimarkdown, reach-me-down, reddish-brown, shiremanstown, stripped-down

14 letters:
blackish-brown, chestnut-brown, greenish-brown, man-about-town

15 letters:
chocolate-brown

20 letters:
canterbury-bankstown