Crustaceous rhymes with:
flirtatious, ostentatious, audacious, capacious, ceraceous, efficacious, fallacious, flirtatious, gracious, hellacious, herbaceous, horatius, ignatius, loquacious, mendacious, ostentatious, perspicacious, predaceous, proteinaceous, salacious, sebaceous, spacious, tenacious, vexatious, vivacious, voracious
Crustaceous sounds like:
careerists, christ's, christakos, christic, christie's, christies, christy's, chrostowski, circuit's, circuitous, circuits, corestates, corestates', corrects, crests, cricket's, crickets, cristo's, crusades, crusts, cruzados, curiosities