Words That Rhyme With "Flash's" :

2 syllables:

acids, ashes, asses, bache's, bashes, basses, batches, brassage, brasses, brushes, bush's, bushes, caches, cashes, cashews, cassis, Cassius, catches, catchings, clashes, crash's, crashes, creches, crushes, dashes, dishes, fish's, fishes, flashes, gas's, gases, gashes, gasses, gouaches, grasses, gushes, hashes, hatch's, hatches, lashes, masses, massive, match's, matches, Mathes, Mathis, meshes, Nash's, passage, passes, passive, patches, pushes, rashes, roche's, rush's, rushes, Russia's, sashes, scratches, slashes, smashes, snatches, splashes, swishes, thatches, thrashes, thrushes, trashes, tushes, washes, wishes

3 syllables:

Agassiz, amasses, antacids, assassins, attaches, backlashes, backslashes, detaches, dispatches, enmeshes, eyelashes, harasses, impassive, mismatches, morasses, mustaches, pastiches, pugnacious, rapacious, refreshes, repassage, surpasses, whiplashes