1 syllable:
--dash, -dash, /slash, asch, asche, ash, ashe, basch, bash, bashe, bcache, bkash, brasch, brash, cache, cash, cashe, chash, clash, crash, crashh, dache, dasch, drash, flasch, flasche, flash, frasch, gash, gcash, gnash, guasch, hasch, hash, kasch, kash, lasch, lasche, lash, masch, masche, mash, mdash, nash, nashe, ndash, pasche, pash, plash, rasch, rasche, rash, sash, shash, slash, smash, snash, spash, splash, stash, tasch, tasche, tash, thrash, trash, zcash

2 syllables:
abash, abrash, amash, atbash, ayyash, backflash, backlash, backslash, backsplash, badmash, barbash, bedash, berdash, black ash, blue ash, bone-ash, bone ash, boyash, brown ash, budmash, cache-cache, cadash, calash, cardcash, chumash, cornbrash, corn tash, dealdash, disk cache, dotdash, drucksache, dubsmash, e-cash, earbash, ecash, emdash, encash, endash, ethash, eyelash, facemash, femslash, fiveash, flingsmash, fly ash, food cache, furash, gate-crash, gatecrash, gnucash, green ash, gulasch, gytrash, habash, hack/slash, hashcash, head crash, heat flash, heat rash, hoop ash, hot flash, izhmash, jazzcash, jim rash, jordache, keysmash, kourbash, lagash, lavash, locash, lodash, lukash, metcash, michmash, mischmasch, mishmash, monash, monyash, moustache, mustache, mustasch, najash, nefasch, nicehash, non-cash, noncash, palash, pay cash, pearl-ash, pearlash, pistache, postcrash, potash, precrash, quamash, red ash, rehash, remache, rose-rash, saltash, sea ash, shabash, shammash, shapash, skin rash, slapdash, squabash, starcrash, storm sash, subash, swamp ash, syvash, taplash, timelash, tongue-lash, unlash, unsplash, whiplash, whitelash, white ash, white trash, yuzhmash

3 syllables:
aftermash, agastache, aktentasche, al-ahbash, alpine ash, aquaslash, astrosmash, balderdash, basket ash, battaash, bitcoin cash, calabash, calipash, callipash, compactflash, cybercash, diaper rash, digicash, dm-cache, downy ash, eurotrash, frazer-nash, geocache, geohash, haberdash, hamantasch, hamantash, interdash, in a flash, kevin nash, kintpuash, macintrash, malagash, manna ash, mountain ash, murmurhash, nettle-rash, nettle rash, overcash, overlash, pebble-dash, pebbledash, petty cash, photoflash, poison ash, poor white trash, prickly-ash, prickly ash, pumpkin ash, ragabash, rosanne cash, rostselmash, sabretasche, shoulder flash, sideflash, silver ash, soda ash, sour mash, spartannash, spatterdash, splatterdash, starofash, succotash, suckatash, synchroflash, tsniitochmash, uralmash, white backlash, window sash

4 syllables:
caustic potash, electroclash, enkutatash, flowering ash, memory cache, oregon ash, shemhamphorasch, white mountain ash

5 syllables:
arizona ash, european ash, metrowagonmash, pranitha subhash, western mountain ash

7 syllables:
american mountain ash, common european ash, european mountain ash

8 syllables:
2020 stock market crash, grimgar of fantasy and ash