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.
foresaid foreside fireside forestay forced forest farside freest frized frusta farced frizzed fairest feracity fieriest firriest furriest voracity first frost frosty frowst versed
resaid foresaid resid reside fireside foreside preside shoreside
fores foresaw foresee fares feres fires force fours frees fries froes