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.
label labella libel labial labile liable libelee lobelia labially libellee lobule lowball
babel label bel viably tabla gable suably cowbell seeable cable sabal cabal rebel jebel libel fable viable babul ably able abele bell liable obeli rubel sable suable doable table
lab labia lobe lube blab blabby flab flabby slab