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.
spunky spunk spunkie spank spuing spang siping sapping seeping sipping soaping sopping souping spaeing supping
punky spunky pinkey pinky punk punka punkey spunk
spun span spin spine spinney spinny spiny