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.
spaeing spang siping spuing supping souping sopping soaping sipping seeping sapping spank zapping zipping spunk spunky spunkie
spaeing keeping cheeping weeping soaping seeping reaping raping peeping leaping gaping peeing jeeping japing heaping beeping aping pieing taping wheeping shaping