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.
skull scull skill skell squill squall squilla squally seagull squillae scall skoal sokol sequel sickle sickly squeal suckle sequela sequelae
skull cull cully gull gully kill quell quill quoll scull seagull skell skill squall squill