Here's what rhymes with longu.
new knew mu nu moo gnu to who you do two too due du u coup qu shoe zu anew dew lieu renew shew su sue tu vous chew 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 goo mew pooh poo shoo roux thew whew into through few true view blue drew grew que crew threw blew flew q canoe clue cue glue hue queue undue cu ensue flue slew stew undo adieu ado brew flu pew thru beaucoup fue hew shrew tzu vnto vue clew redo slue phew wazoo achoo review revenue pursue screw avenue bamboo accrue rendezvous retinue taboo untrue overdue piu skew tattoo eschew outdo revue shampoo sinew sprue imbue overdo strew halloo spew valuer endue fondue foreknew zebu indue kazoo muumuu overshoe booboo regrew atishoo overview residue debut subdue caribou jusqu overthrew kangaroo askew outgrew ballyhoo cockatoo honeydew marabou overflew prevue overdrew overgrew interview hitherto withdrew construe bugaboo peekaboo bestrew buckaroo barbecue hullabaloo barbeque superglue misconstrue