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.
brens barrens boreens barns burns brins brans bareness browns brines burins brains bairns borons bruins burans brawns bourns barons boranes brinies burnies burnous bournes barneys barrenness byrnies brownies baronnes baronies birianis brionies baroness beeriness brownness bronze bronzy burnoose brownnose
wrens brens warrens sirens syrens barrens pornos bourns varnas burins learns girns pyrans liernes arenes herns brans barons bournes cornus borons marrons irons barns lorans girons gyrenes currans porns moreens brins grans pirns yarns sharns churns warns diurons turns triens pereons treens terrenes pyrenes terns tarns boreens greens sarins kerns horns reruns furans purins corns arenas earns erns kernes rins grins karns ferns curns herons runs careens carns reins journos frons querns burans airns preens sarans gyrons garrons morons mourns hyperons mureins ornis mirins serenes serins firns sorns phrensy wyverns burns sereins neurons kirns rouens reearns perrons cairns ernes darns bairns durns ternes terreens trans trienes tureens urns morns shairns shorans yearns
bren barn barney barny boreen born borne bran branny brin brine briny burn burnie byrnie