Colder rhymes with:
beholder, bolder, boulder, dolder, folder, golder, holder, molder, moulder, nolder, older, polder, shoulder, smolder
Colder sounds like:
caldeira, calder, caldera, calderaro, caldor, caulder, childree, childrey, clatter, claytor, clothier, cloture, clouatre, clouthier, cloutier, clutter, coldwater, collider, colter, coulter, culture