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.
tarpon tarpan trapan tropin terpene tropine terrapin trappean truepenny trepan
tarpon arpen hairpin harpin harpoon hereupon crepon orpin propone tarpan whereupon sharpen
tarp trap trip tripe trippy trop trope