Koop rhymes with:
coop, coupe, recoup, scoop, alleyoop, arup, boop, coop, coupe, croup, doupe, droop, drupe, dupe, goop, group, groupe, grupe, guadalupe, guadeloupe, hoop, houp, hupe, intergroup, knoop, loop, loup, loupe, lupe, oop, poop, recoup, regroup, roop, roope, roupe, rupe, scoop, shoop, shoup, shoupe, shupe, sloop, snoop, soup, stoop, stoup, stroop, stroope, stroup, stroupe, swoop, swoope, throop, troop, troup, troupe, whoop
Koop sounds like:
kabbah, kabi, kaifu, kapp, kappa, kashuba, kassab, kaszuba, kaufhof, kaup, kaupp, kauppi, kayapo, kazikaev, kcop, keef, keefe, keeffe, keep, kepp, khufu, kibbe, kibbee, kibbey, kibby, kibeho, kickoff, kief, kiev, kiff, kip, kipp, kivi, koba, kobe, koby, koep, koepp, koeppe, koff, kofi, kofu, koob, kope, kopf, kopp, koppe, kopy, kosbie, kosecoff, kosiba, kosovo, kosub, kosyakov, kouba, kozub, kuba, kube, kubo, kuby