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