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.
tupelo tapalo duple tepal typal deploy diploe tipple topple duopoly
tupelo peal chapel tapalo deploy spell speel ripely replow repel repeal rappel cupel peel appel appeal polo ploy plow pele speil spiel diploe lapel shapely
tup dupe tape taupe tepee tope topee toupee type typey stupa stupe