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.
ionised ionized inset incite inside inosite ionicity
ionised lionised tensed sensed rinsed moonseed mensed lionized linseed lensed jonesed quinsied ionized fancied ensued aniseed nosed noised censed deionized unused