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.
neifs naifs knifes neighs nevus nighs neves naves naffs nieves knaves knives navies naives naevus navvies nephews niveous
reifs neifs seifs ifs efs leafs waifs teffs diffs knifes defis jiffs difs tiffs coifs effs fiefs refs wifes chiefs biffs kaifs quiffs naifs keefs reefs kiefs rifs riffs cuifs jefes beefs kifs fifes miffs levis kefs whiffs chefs sheafs
neif knife naif neigh nevi sniff sniffy unify