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.
case cause causey casa caws cays cosey cosie gawsie cassia cuisse kas cos gas keas gaes coos cuss gaze cues kaas cosy cows koas gays kaes coys kays goas coss cusso quass gauze quais gauss goose gawsy cozey guise cozie quasi gassy quays
base ease fease phase vase case lase lease pase pease rase cease tease chase as