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