Here's what rhymes with ku.
coup oo ou qu ooo eu coo cou gu oooo ooooo goo ooh to who you do two new too due knew du grew que u crew q shoe zu clue cue dew glue lieu queue shew su sue tu vous chew cu deux fu lu rue zoo bu hu ju jus loo mu nu peu pu seu shu sou vu woo yew yu boo chou chu doo ewe feu ru shou thu tue vou wou wu clew moo pooh poo shoo gnu roux thew whew achoo through few true view blue drew threw blew flew screw anew canoe hue accrue flue slew stew adieu ado brew flu pew skew thru beaucoup fue hew mieux shrew tzu vue mew kazoo slue phew into pursue renew undue ensue taboo undo jusqu piu tattoo eschew outdo sprue vnto askew outgrew redo strew halloo spew valuer foreknew zebu wazoo booboo regrew review avenue bamboo debut subdue untrue caribou overdue kangaroo revue shampoo sinew imbue overdo cockatoo bugaboo endue indue peekaboo buckaroo muumuu overshoe overgrew atishoo revenue hitherto overview residue withdrew retinue construe overthrew ballyhoo honeydew fondue marabou bestrew overflew prevue superglue overdrew interview rendezvous barbecue barbeque hullabaloo misconstrue