Here's what rhymes with backnow.
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 beaux cho dau roe sho yeux zo rho whoa doh kayo schmo schmoe ago flow blow slow throw pro audio fro patio thro bio nouveau aglow cameo domino floe tuo bro dunno stow throe trow kapok sloe tarot bandeau gateau gateaux although below plateau bestow buffalo chateau hello bungalow dynamo polio propos tableau aliquot dicho escrow outgrow siglo tableaux topos chateaux plateaux trousseau adagio chapeau oleo piccolo 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 mistletoe pianissimo pistachio mustachio microdot moustachio politico presidio braggadocio portfolio archipelago impresario generalissimo