Polychrome rhymes with:
ferrochrome, monochrome, aerodrome, cosmodrome, ferrochrome, hippodrome, monochrome, syndrome, aerodrome, alamodome, astrodome, biome, catacomb, chromosome, cosmodrome, cyclostome, ferrochrome, framatome, genome, goldome, hippodrome, honeycomb, lincicome, liposome, metrodome, minatome, monochrome, rhizome, seaholm, silverdome, skydome, styrofoam, syndrome
Polychrome sounds like:
pelagreeny, pellegrin, pellegrini, pellegrino, pilgram, pilgreen, pilgrim, pleasurama, polygram