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.
brashy brash brushy brush brach breach broach bearish boarish boorish brachia birch breech broche brooch brioche barouche birrotch
brashy trashy rash rushy brash brushy harsh crash marsh marshy preachy trash