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