Styrofoam rhymes with:
aerodrome, alamodome, astrodome, biome, catacomb, chromosome, cosmodrome, cyclostome, ferrochrome, framatome, genome, goldome, hippodrome, honeycomb, lincicome, liposome, metrodome, minatome, monochrome, polychrome, rhizome, seaholm, silverdome, skydome, syndrome