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.
piercer pricer peruser prisere prizer prosier pursier pricier praiser prissier pressure preassure parser proser purser presser pressor pursuer
coercer mercer piercer fiercer grocer terser sorcery pricer mercery farceur verser forcer farcer bracer ricer racer tracer
pierce piers piracy pipers spiers