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.
silicas slicks silkies siliques silks slags siliquose siliquous slacks slakes sulcus celiacs silex slogs slugs sulks sleeks salukis sawlogs selkies sulkies
maiolicas gallicas silicas clicks celiacs rollicks relics klicks killicks colics cowlicks laics calicos flics flicks beylics licks slicks
silica salic siliqua siliquae silique silkie slick