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.
shields chields childes sheltas sialids cheloids chiliads shelties chelates shallots
bields fields chields yields wields shields elds velds gelds dildos wilds builds felids milds melds gilds wealds welds guilds silds childes tildes
shield chield shelled shelta sheltie shelty shilled