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.
piggish puggish peakish peckish puckish picacho
biggish boggish haggish hoggish jiggish loggish piggish puggish doggish waggish woggish aguish voguish roguish