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.
boreens brens bourns borons bournes boranes barrens brans burns barns brins bareness beeriness bairns browns burans brawns barons brains brines burins bruins barrenness brinies byrnies barneys burnies baronnes baronies brownies brionies birianis baroness brownness bronze bronzy burnous
boreens careens preens tureens terreens moreens treens greens serenes barrens mureins reins gyrenes wrens sirens sereins arenes pyrenes arenas phrensy syrens pereons terrenes brens triens warrens