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.
rodent rident retint radiant reddened redenied retinite rotund redound rotunda ratooned rattened redonned retinoid
cadent dent rodent rident addend detent tent pedant audient potent dint dunt tenet tenty headend quotient latent patent patient stent attent detente