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.
piastre pasture piaster paster pastor pastry pastier posture pester poster pestier
piastre bestrew gesture castor feaster faster vaster boaster bistre easter pasture stare raster pastor roaster ossature taster master waster laster wastry gaster baster satire posture gastrea caster coaster stere store vesture aster astir strew austere piaster restore pastry diaster paster toaster moisture wastrie lustre chaster
past pasta paste pastie pasty piste pistou pst