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