Raster rhymes with:
aster, astor, blaster, caster, castor, disaster, faster, gaster, grandmaster, headmaster, jaster, kaster, laster, macmaster, master, mcmaster, oleaster, paster, pastor, pasztor, pilaster, plaster
Raster sounds like:
racketeer, rakestraw, rastetter, raxter, reactor, rector, rectory, regester, register, registrar, registry, reister, requester, resetar, rester, restore, restorer, richter, riester, riesterer, righter, rister, roaster, rochester, rocketry, roister, rooster, rossiter, roster, royster, rustier