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.
phrensy frenzy freeness ferns firns frons frowns furans varnas farinas farness furanes virions wyverns
phrensy gyrenes tureens treens terreens sirens sereins preens mureins moreens guernsey greens currency careens frenzy reins brens boreens barrens arenes arenas wrens pereons pyrenes serenes syrens terrenes triens warrens