Here's what rhymes with watteau.
bo doe dough po toe tow beau jo beaux cho dau doh no so know go though low show co blow pro row tho fo foe ho lo audio mo ro wo woe yo bio ceux faut goe hoe ko sew soe vo mow noe roe sho tuo yeux zo bro rho stow trow chapeau whoa chapeaux although below ago flow grow slow snow throw glow quo fro chateau crow patio thro uno dicho floe topos chateaux dunno throe kapok sloe tarot turbot bandeau gateau kayo matzoh fatso gateaux pekoe borzoi schmo schmoe radio plateau undergo bestow hello forego forgo nouveau polio propos tableau vertigo aglow aliquot apropos cameo outgrow rodeo tableaux plateaux trousseau oleo undertow deathblow foreknow trousseaux resew ratio embryo studio buffalo folio indigo portico stereo calico dynamo domino escrow medico siglo spatio afterglow adagio piccolo regrow pompano romeo tallyho overthrow overflow bungalow mistletoe oregano overgrow microdot moustachio portfolio politico presidio pistachio mustachio archipelago braggadocio pianissimo impresario generalissimo