Flattish rhymes with:
british, brutish, fetish, kertesz, lettish, rightish, scottish, skittish, smartish, soltesz, whitish
Flattish sounds like:
fallouts, falotico, faulds, faults, feldhaus, feltes, felts, feltus, feltz, field's, fieldhouse, fields, fields', fildes, filets, fillets, flatheads, flats, fledge, fleet's, fleets, fleitas, floats, floods, flouts, fluids, flutes, folds, folts, foltz, foulds, fults, fultz