Voest rhymes with:
boast, coast, coste, diagnosed, droste, engrossed, ghost, grossed, host, ivory-coast, khost, most, ost, post, riposte, roast, toast, toste, woeste, yoast, yost
Voest sounds like:
vacate, vacated, vaguest, vajda, vashti, vast, vasta, vaught, vegetate, vest, vesta, vested, vexed, vicissitude, viscosity, visigoth, visit, visited, vist, vista, voght, vogt, voiced, voight, voigt, vojta, vouched, vought, voyaged