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