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.
firemen fireman foremen freemen firman foramen foreman freeman ferrymen ferryman fermion
foremen firemen choremen wiremen premen foreman choreman duramen airmen mermen dairymen carmen fireman jurymen germen freemen rumen ferrymen ramen preman barmen crewmen cerumen doormen wireman reman foramen chairmen quarrymen