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