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.
slake slack selkie silkie slag sulk silk sawlike soullike seallike siliquae slick sleek silky sulky saluki silica slaggy sleeky siliqua silique slog slug
lake flake slake toylike doughlike talkie algae alack hoelike clack belike black bleak alike bloke tilak woollike lack beelike kulak quaylike owllike plack raylike seallike silkie folkie bowllike flaky laky flakey fluke jawlike slack alkie veillike lakh bowlike eellike flak leke like cloak flack leak kulaki lawlike pealike pollack sawlike selkie soullike taillike tealike toelike wheylike shellack