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