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