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