Here's what rhymes with expansioi.
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 sloe whoa doh bandeau schmo schmoe although ago blow grow pro glow quo audio chateau crow hello patio bio uno cameo domino tuo bro chateaux trousseau trow chapeau tarot kayo matzoh chapeaux fatso trousseaux borzoi tallyho resew below ratio plateau studio undergo bestow buffalo folio stereo bungalow dynamo forego forgo polio propos tableau aglow aliquot dicho escrow siglo spatio tableaux topos dunno plateaux adagio kapok oleo turbot undertow deathblow foreknow gateau pompano gateaux pekoe romeo radio embryo overthrow overflow indigo calico vertigo apropos medico mistletoe outgrow rodeo afterglow pianissimo piccolo pistachio overgrow regrow mustachio moustachio portico presidio microdot portfolio politico oregano braggadocio archipelago impresario generalissimo