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