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