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.
smell smelly small samiel sawmill smile sambal seemly simile smiley symbol
smell mell mel camel timely homely dumbbell pummelo gimel pumelo pomelo lamely lamella kummel gamely comely mill mull mewl meal mall namely pommel pummel samiel small moll sawmill smelly tamely umbel