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.
decoys decos decays decks deoxy dekkos dickeys docs doxy dexy dogs dioicous ducks tacos dagos dukes dikes dicks degas docks dykes dekes dagoes tokays degauss dickies doggies duckies dex
coys decoys cos wackos ficoes guacos cosy buckos decos sickos raucous dioicous chicos cocos locos cacaos jocose geckos fucous fucose mucose cozy boocoos coss cogs cows decays scows mucous mucosa cocoas jucos locoes jockos cays cooeys coos goys tacos whackos shackos