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