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.
fur four fury feuar furry furrow fro fry fer fir for far furrowy free froe fray faro frae fere fear fair fire frow fare fiar fore fora fiery foray faery firry fairy ferry feria faerie farrow feirie feriae forwhy