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.
stemmed steamed stummed stimied stymied stemmata steamboat stomata stomate
stemmed dammed stummed steamed reteamed redeemed modemed goddammed itemed bedimmed tommed deemed teemed teamed dummied dimmed demoed adeemed diademed
stemma stemmy stem satem steam steamy