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.
luscious lusus lysis lassis louses lassos laicise lassies lassoes lyses lases luces leses loses lasses leases looses losses lyssas
vicious luscious diecious dioecious piceous poaceous cis