Here's what rhymes with rainbowe.
bo doe dough po toe tow beau jo beaux cho dau 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 tuo yeux zo bro rho stow trow whoa below ago flow ratio grow radio slow snow throw glow quo audio fro chateau crow thro nouveau uno dicho floe topos chateaux dunno throe chapeau kapok sloe tarot turbot bandeau gateau kayo matzoh chapeaux gateaux pekoe borzoi romeo schmo schmoe although embryo plateau undergo bestow hello indigo patio polio propos tableau aglow cameo medico outgrow rodeo tableaux plateaux trousseau oleo undertow deathblow regrow fatso trousseaux resew studio buffalo folio stereo dynamo forego forgo vertigo aliquot apropos domino escrow mistletoe siglo spatio adagio piccolo foreknow pompano microdot tallyho overthrow overflow portico bungalow calico presidio afterglow oregano overgrow mustachio moustachio politico pistachio portfolio archipelago impresario braggadocio pianissimo generalissimo