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