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