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.
spank spang spunk spunky spaeing spunkie siping spuing sapping seeping sipping soaping sopping souping supping
spank pang pink punk spang spunk
span spawn spean spin spine spinney spinny spiny spun