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