Colombo's rhymes with:
galambos, gombos, jimbo's, abo's, bonobos, cobos, dobos, doornbos, galambos, gombos, hoboes, jimbo's, nonturbos, placebos, turbos, vandenbos, villalobos, zabows
Colombo's sounds like:
clamps, cleanups, climbs, clumps, colombia's, columbia's, columbus, columbus', columbus's