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.
sequel sequela sequelae squeal squall squill seagull squally squilla squillae scull skell skull
sequel quell ekuele equal vaguely coequal sequela squeal sheqel