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.
sirens syrens sereins serenes sorns soreness sureness sarans sarins sciurines serins serines saurians serranos sourness sorriness
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
siren serein serene sierran syren