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