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.
sward seaward swart sword swarty sewered
ward leeward hayward seaward sward wayward coward toward vaward reward award reword wared byword bewared word wart sword keyword swart