Here's what rhymes with mmou.
new knew oo ou ooo eu mu nu oooo ooooo moo gnu ooh to who you do two too due du u coup qu shoe zu anew dew lieu 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 renew undue cu ensue flue slew stew undo adieu ado brew flu pew thru fue hew shrew tzu vnto vue clew slue phew achoo pursue screw avenue bamboo accrue taboo untrue piu skew tattoo beaucoup eschew outdo shampoo sinew sprue imbue redo strew halloo spew valuer endue zebu indue kazoo muumuu wazoo booboo review revenue debut retinue subdue jusqu overdue kangaroo revue askew outgrew overdo honeydew fondue foreknew marabou overshoe regrew atishoo interview hitherto overview residue withdrew rendezvous caribou construe overthrew ballyhoo cockatoo bugaboo peekaboo bestrew buckaroo overflew prevue overdrew overgrew superglue barbecue hullabaloo barbeque misconstrue