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