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.
forcer farcer farceur fiercer foreseer frizer freezer friseur frizzer furzier frizzier frouzier frowsier frowzier
farcer forcer coercer fiercer piercer mercer grocer racier courser pricier terser sorcery hoarser verser mercery tracery nurser tracer coarser bracer curser grocery bracero racer purser dorser pricer ricer parser farceur worser
force farce farci farcie farcy forays fores foresaw foresee fours