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