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.
silicon silicone slicken silken slogan slacken sleeken
silicon helicon balcony falcon flacon gallican pelican silicone
silica salic siliqua siliquae silique silkie slick