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.
immense immunise immunes imines immunoassay immunize
immense mense tameins siemens cymenes omens lumens lomeins limens commence bemeans amens miens menus mensae mensa means manse hymens rumens semens demeans yamens