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.
naifs naffs neifs knifes naives navies navvies naves nighs novas knaves knives naevus neighs nieves niveous
kaifs naifs waifs ifs seifs rifs kiefs reifs kafs knifes pavis cuifs tiffs naffs gaffs miffs loafs quiffs diffs caffs wifes chaffs sheafs neifs leafs quaffs mavis biffs safes riffs raffs oafs cafes fiefs coifs fifes haafs kifs jiffs baffs daffs difs waffs whiffs chafes chiefs yaffs
naif knife naff naive neif snafu sniff sniffy unify