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