Here's what rhymes with posteau.
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 bestow 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 sloe whoa bandeau chapeaux schmo schmoe although below ago grow glow plateau quo audio buffalo crow hello patio propos uno dicho topos dunno plateaux adagio kapok tarot turbot deathblow gateau kayo fatso gateaux pekoe borzoi ratio radio studio undergo folio portico stereo forego forgo nouveau polio tableau vertigo aglow aliquot apropos cameo domino escrow outgrow rodeo siglo spatio tableaux afterglow trousseau oleo undertow foreknow matzoh pompano trousseaux tallyho resew embryo overthrow overflow indigo bungalow calico dynamo medico mistletoe presidio piccolo pistachio overgrow regrow mustachio romeo moustachio portfolio politico oregano pianissimo microdot braggadocio archipelago impresario generalissimo