Here's what rhymes with mngno.
no know o au oh owe aux mo eau ow eux mow noe oe 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 beaux cho dau roe sho yeux zo rho whoa doh kayo schmo schmoe ago flow blow slow throw pro fro thro bio nouveau aglow cameo floe tuo bro dunno stow throe trow kapok sloe gateau gateaux although below audio chateau hello dynamo dicho domino escrow outgrow siglo topos chateaux chapeau oleo tarot turbot foreknow regrow bandeau matzoh chapeaux pekoe borzoi romeo resew ratio radio embryo plateau undergo bestow folio indigo patio bungalow calico forego forgo polio propos tableau aliquot medico rodeo tableaux oregano plateaux trousseau piccolo undertow deathblow overgrow pompano fatso trousseaux microdot overthrow studio buffalo overflow stereo vertigo apropos mistletoe spatio afterglow adagio tallyho portico pianissimo mustachio moustachio politico presidio pistachio portfolio archipelago impresario braggadocio generalissimo