4 letters:
haus, laos

5 letters:
bouse, chaus, couse, douse, dowse, fouse, gauss, graus, hause, hauss, house, houss, klaus, kraus, luaus, mause, mouse, nouse, rouse, youse

6 letters:
blouse, brouse, clouse, crouse, grouse, hausse, knouse, krauss, krouse, palaus, prouse, rousse, schaus, scouse, shouse, smouse, spouse, straus, trouse, xmouse

7 letters:
arbouse, bauhaus, chausse, degauss, espouse, inhouse, jalouse, landaus, milhous, neuhaus, niehaus, palouse, pelouse, rathaus, rehouse, rothaus, sprouse, strause, strauss, strouse, trousse, unhouse, uprouse, zamouse

8 letters:
ackhouse, alehouse, althouse, arthouse, backhaus, baghouse, beehouse, berghaus, bighouse, brauhaus, bughouse, burnouse, cathouse, cowhouse, dalhouse, dishouse, doghouse, dormouse, driehaus, durchaus, dyehouse, dykhouse, ecohouse, feldhaus, funhouse, gashouse, gasthaus, ginhouse, grothaus, henhouse, hochhaus, holthaus, hothouse, icehouse, in-house, kamphaus, looshaus, madhouse, milhouse, mughouse, mulhouse, newhouse, nienhaus, nuthouse, outhouse, parkhaus, penhouse, pochouse, pothouse, rathouse, rowhouse, spamhaus, taphouse, teahouse, titmouse, toyhouse, zeughaus

9 letters:
abbenhaus, allshouse, almshouse, art-house, babyhouse, backhouse, bakehouse, barklouse, barnhouse, bathhouse, beadhouse, bedehouse, beerhouse, bellhouse, blockhaus, boathouse, bolthouse, booklouse, brewhouse, brighouse, brockhaus, bunkhouse, cardhouse, chilehaus, chophouse, clubhouse, coalmouse, colemouse, cookhouse, cornhouse, deadhouse, deckhouse, dollhouse, dosshouse, ex-spouse, farmhouse, firehouse, flophouse, gamehouse, gatehouse, gillhouse, headlouse, hillhouse, hot-house, jailhouse, kilogauss, lamphouse, limehouse, lofthouse, longhouse, mad'house, malthouse, masthouse, megahouse, millhouse, moorhouse, morehouse, neathouse, oncomouse, packhouse, peelhouse, penthouse, pesthouse, pevehouse, pit-house, playhouse, poorhouse, posthouse, pot-house, rearmouse, reermouse, reremouse, roadhouse, rosenhaus, safehouse, shophouse, steinhaus, stenhouse, tollhouse, toolhouse, townhouse, treehouse, treibhaus, warehouse, washhouse, wearhouse, wellhouse, winehouse, wirtshaus, wodehouse, woodhouse, woodlouse, workhouse

10 letters:
acid-house, bark-louse, bawdyhouse, blackhouse, blockhouse, brickhouse, brockhouse, card-house, chop-house, clickhouse, clownhouse, coal-house, courthouse, crackhouse, crazyhouse, culvahouse, deck-house, disespouse, doss-house, fieldhouse, fieldmouse, flea-louse, glasshouse, greathouse, greenhouse, grindhouse, guardhouse, guesthouse, herrenhaus, lighthouse, microgauss, microhouse, micromouse, milligauss, moorehouse, moot-house, oast-house, overblouse, pilothouse, powerhouse, pricklouse, rastamouse, roughhouse, roundhouse, sandgrouse, shrewmouse, smokehouse, spekehouse, stackhouse, stagehouse, statehouse, steakhouse, stillhouse, stonehouse, storehouse, stovehouse, sugarhouse, tittimouse, trusthouse, watchhouse, waterhouse, wheelhouse, whitehouse, whorehouse, womanhouse, woodgrouse

11 letters:
barrelhouse, bawdy-house, block-house, chargehouse, churchhouse, coffeehouse, courtehouse, culverhouse, customhouse, easterhouse, eek-a-mouse, glickenhaus, guest-house, hemminghaus, hungryhouse, krankenhaus, lenbachhaus, motherhouse, porterhouse, rattlemouse, rittenhouse, rottinghaus, rough-house, ruckelshaus, schoolhouse, spitalhouse, springhouse, steinkrauss, sugar-house, summerhouse, swishahouse, systemhouse, weigh-house, whore-house

12 letters:
chapterhouse, charterhouse, coffee-house, custom-house, customshouse, draughthouse, eating-house, fachwerkhaus, flickermouse, flindermouse, flittermouse, fronterhouse, garlinghouse, intellimouse, levi-strauss, meetinghouse, michaelhouse, mickey-mouse, niedringhaus, packinghouse, stationhouse, summer-house, tiring-house, westinghouse

13 letters:
boardinghouse, boultinghouse, cat-and-mouse, chapter-house, charnel-house, clearinghouse, countinghouse, dwellinghouse, festspielhaus, holyroodhouse, kehlsteinhaus, laughinghouse, lombard-house, meeting-house, splatterhouse

14 letters:
boarding-house, clearing-house, drinking-house, front-of-house, house-to-house, schauspielhaus, slaughterhouse, sponging-house, tippling-house, treasure-house, trugging-house

15 letters:
slaughter-house

16 letters:
abgeordnetenhaus

18 letters:
white-westinghouse

20 letters:
welcome-to-our-house

21 letters:
detlev-rohwedder-haus

4 letters:
outs

6 letters:
doubts, routes, scouts

7 letters:
lao-tse

11 letters:
thereabouts