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.
fiercer farcer forcer farceur frizer verser friseur frizzer furzier frizzier frouzier frowsier frowzier freezer
coercer mercer piercer fiercer grocer terser sorcery pricer mercery farceur verser forcer farcer bracer ricer racer tracer