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