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.
pigs pugs pegs pics piggies picks pikas picas pikes pikis peags paiks pokies piques pix pecs pixy pacs pacas packs peaks pecks peeks pekes pixie pocks pokes pucks pukes pyxie
bigs figs vigs gigs jigs migs pigs rigs cigs zigs digs whigs wigs