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