Circularize rhymes with:
popularize, popularize, burglarize, colorize, polarize, popularize, accessorize, authorize, burglarize, categorize, characterize, colorize, computerize, containerize, demilitarize, depressurize, familiarize, glamorize, memorize, mesmerize, militarize, miniaturize, mischaracterize, motorize, pasteurize, plagiarize, polarize, polymerize, popularize, pressurize, pulverize, reauthorize, rubberize, samurai's, samurais, satirize, summarize, temporize, terrorize, theorize, vaporize, winterize
Circularize sounds like:
chrysler's, chryslers, circulars, crassweller's