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.
waylay walla wallah wail wale wall waly waul wawl weal wally whale wheal wallie wallow
waylay lay phyla relay allay belay boyla bylaw feyly hyla flawy slay flay clay coyly cullay gayly play wryly delay doyly phylae doyley shyly