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