Buttercups rhymes with:
backups, checkups, eggcups, hookups, linkups, markups, pickups, shakeups, backups, buildups, checkups, cleanups, coverups, eggcups, grownups, hangups, holdups, hookups, lineups, linkups, markups, pickups, push-ups, pushups, runups, setups, shakeups, startups