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.
regrows regress recross rigorous rakers recurs rigors rigours reekers riggers rackers ruggers raygrass recourse requires wreakers wreckers recarries rockers
grows regrows crows gross aggros checkrows