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.
spiky spikey spik spick spike spooky spic spoke spica speak spake sepic spook speck spicae sapphic seppuku spec
spiky paik pick picky pika pike piki poky gopik spick spik spike spikey tupik