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