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