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