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.
lilacs laliques
lacs lilacs shellacs talcs lacks shellacks telcos sulcus slacks relics polkas blacks lags laics alecs algas belgas beylics cloacas slags tilaks flags flics flocs clacks clags colics kulaks flacks gulags placks pollacks celiacs blocs