Whoops rhymes with:
swoops, coupes, drupes, dupes, group's, groups, groups', hoopes, hoops, intergroup's, koop's, koops, loops, oops, poops, recoups, scoops, soup's, soups, stoops, swoops, toops, toups, troop's, troops, troops', troupe's, troupes
Whoops sounds like:
wabash, wabash's, waives, waves, weaves, webb's, webbs, webs, weeps, whipkey, whipps, whips, whipsaw, wiebke, wiebusch, wife's, wipes, wives, wives', wobig, wops