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