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.
plucked placket plagued plugged polkaed placate placoid plicate polecat polycot
lucked clucked plucked hillocked shellacked fluked sulked flocked slacked flicked relocked blocked flecked bulked hulked flacked clocked caulked clicked blacked baulked locked licked clacked lacked rollicked slicked talcked shylocked