I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
narcos narcose narcs narks
narcos raucous narcose lyrics mercs grogs curacoas groks crocs cargos darics curacaos seracs tarocs sarcous torcs cercus touracos pargos turacos orcas verrucous varicose arcus orcs narcs marcs verrucose rocs arcs largos barcas frogs recs durocs sorgos taroks sargos torics circus trogs progs turacous
narc narco naric nark narky snark snarky