Plaster rhymes with:
blaster, laster, pilaster, aster, astor, blaster, caster, castor, disaster, faster, gaster, grandmaster, headmaster, jaster, kaster, laster, macmaster, master, mcmaster, oleaster, paster, pastor, pasztor, pilaster, raster
Plaster sounds like:
pelster, pilaster, plasterer, policastro, pollster, polster, polyester