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.
four fur for fury fora fore feuar foray furry forwhy furrow fry far fir fer fro furrowy frow free faro fiar fair froe fere fray fare fear frae fire faery fairy feria ferry fiery firry vrouw
four hour giaour lour our pour sour dour tour your or