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.
slugs slogs slags sulcus sawlogs salukis siliques sulks silks siliquous siliquose slacks slakes sleeks slicks selkies silicas silkies sulkies
lugs slugs plugs glugs clogs duologs bowlegs sulcus lags clags slogs sawlogs colugos flogs gulags cologs vulgus belugas belgas algas logs blogs legs valgus slags dialogs flags taluks