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.
sleek sleeky sulk silk slick sulky slake slack silky saluki selkie silkie sawlike silique seallike siliquae soullike slag slog slug
leek belleek cleek gleek sleek lek leak leke leku bleak fleck sleeky
sale seel seely slew sloe slue sole solei isle