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.
speck spec speak spick spic spik spook sepic spake spike spica spiky spoke spicae spikey spooky sapphic seppuku
peck kopeck speck copeck pec peak shoepack apeak peek speak puck kopek bipack pack peke apeek repack pick spec pecky spick pock yapock