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.
secrete secret screed secured security scart cigarette scared sacred scried scored scrota cigaret scoured skirret scarred saggered skywrite skywrote suckered scrod skirt skort squirt skirred squared squired sugared
secrete aigrette carte screed recreate picrite picrate hypocrite ocreate cocreate eucrite ecarte curette caret curet cruet creed create crate recrate cigarette secret decreed
scare scarey score scree screw screwy secure sucre