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.
bigs biogs bigos biogas begs bugs bags bogs biggies bogus bikes bagass bekiss bikies buggies bookies baggies bagasse backs bakes beaks becks bocci bocks books bucks
bigs figs vigs gigs jigs migs pigs rigs cigs zigs digs whigs wigs