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.
pansies penises pensees hypnoses hypnosis ponces pounces panaceas pinnaces
quinsies tansies pansies hypnoses ionises noses linseys ensues guanases genesis kinases manses newsies kneesies downsize anises nonuses bonuses enosis pensees rinses sanseis senses synesis zoonosis tennises tonuses gnosis lionizes anuses nancies minuses onuses fancies lenses kinesis genuses gnoses kenosis hypnosis hanses finises tenses mannoses venuses lionises penises rennases censes senseis sinuses zoonoses deionizes menses ionizes unsews
pans pains panes pansy pawns peans pians spans