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.
fast feast vast fist fest foist facet vasty fusty feist ghast fiesta facete faucet feisty feased fissate fossate fossette phaseout vest faced fazed fused ghost vesta visit vista
bast cast wast roast oast mast least last gast coast hast beast vast ghast feast fast east boast past toast yeast