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.
gonif goniff gonef gonof ganef ganof gonoph connive
gonif knife naif neif vinify gonef goniff gonof minify reunify sniff unify
gonia coni goanna gone goon gooney goonie goony gown agon agone agony