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.
cipherer spherier severer seafarer sufferer
cipherer fearer chafferer deferrer fierier fuehrer fuhrer verier hoverer coverer quaverer quiverer offerer referrer reverer severer spherier sufferer waverer shiverer