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.
keck kick keek kicky keg coke kike cake cock cuke guck kaka kaki kook caeca cakey cocky kaiak kooky quack quake quick
beck feck heck geck keck neck peck reck wreck deck check