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.
cigs zigs saigas sickies sacs zags secs sics segs skis sags sacks scows sikes socks sagas sagos socas sicks cycas sikas segos sucks skies sakis
bigs figs vigs gigs jigs migs pigs rigs cigs zigs digs whigs wigs