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.
costa costae cost coast coset casita cosset cuesta cast cassata coesite caste cosied caseate casette gooiest cassette gast gust kist
hosta costa fiesta seta boost boast stoa stay cassata staw joust cuesta ghost moste oust peseta post roost roust siesta dost testae tost moist foist vesta most hoist host joist casita coast cost vista ghosty coset lost costae oast pasta posit roast roset cesta doest testa toast wost
cos coos cosey cosie coss cosy cows coys cogs