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