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.
siliquae siliqua silique silica silkie slake sawlike silk slag slug seallike soullike silky slack sleek slick salic celiac selkie slaggy sleeky
siliquae clique cliquey lalique relique reliquiae siliqua silique