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.
combats comates comatose comets comtes commits comities commutes coembodies committees comedos gambits gomutis comedies commodes gambades gambados gumboots gambadoes gummatous commodious gamuts gametes
numbats combats wombats mats moats comates teammates roommates bumboats mammatus lambdas gambits humates gemmates summates meats mauts matts mates remates ambits hamates
combat coembody comade comate combed commata