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