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.
fiar fir far fair fire fear faro fare fiery feuar fairy feria firry faery feirie feriae farrow fur var fer fro for fry four vier fere frow vair fury frae froe free fray fore fora vara vary ferry foray furry varia vireo