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.
offset offside
offset fast fest fist avoset buffest heavyset liefest loveseat rifest safest deafest deffest chiefest chuffest