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.
argus argues arcus argosy arcs arks araks arecas arkose arracks
argus argues brogues ergs brags bourgs brigs prigs cercus reargues sargos morgues drags piraguas grogs drogues garigues teargas cargos trigs frigs trugs frugs choregus burgs bergs arcus pirogues regs rigs frags rugous rugs rogues progs circus rerigs sorgos pargos rags dregs largos drugs grigs tragus crags trogs frogs choragus virgas shrugs