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.
trapan trappean tarpan trepan terrapin tarpon tropin terpene tropine truepenny
trapan firepan frypan priapean propane tarpan terrapin trappean trepan
trap drape drapey tarp trip tripe trippy trop trope strap strappy