Aster rhymes with:
astor, blaster, caster, castor, disaster, faster, gaster, grandmaster, headmaster, jaster, kaster, laster, macmaster, master, mcmaster, oleaster, paster, pastor, pasztor, pilaster, plaster, raster
Aster sounds like:
accusatory, aciduria, actor, actuary, actuator, acustar, agitator, akhtar, ashtray, astaire, astor, astore, astoria, astra, astray, astro, auchter, auster, austere, austria, austro, aztar