Here's what rhymes with fouroh.
low row lo ro yo roe yeux rho no so know go though 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 whoa doh although below ago snow quo audio folio hello bio forego forgo nouveau uno aglow siglo tuo stow oleo tarot foreknow kayo borzoi schmo resew schmoe ratio radio overthrow plateau studio overflow chateau stereo polio propos tableau aliquot dicho escrow outgrow rodeo tableaux topos chateaux dunno plateaux trousseau chapeau kapok turbot deathblow overgrow regrow gateau chapeaux fatso gateaux pekoe trousseaux romeo embryo bestow buffalo patio calico vertigo apropos cameo domino spatio afterglow adagio piccolo bandeau matzoh tallyho undergo indigo portico bungalow dynamo medico mistletoe oregano undertow pompano microdot portfolio politico presidio pistachio mustachio moustachio archipelago impresario braggadocio pianissimo generalissimo