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.
neurons neurones neurines nearness
neurons diurons urns curns marrons hyperons irones furans frowns virions maroons morions kroons morrions roans heroins chorions groans perrons croons purins coronas burns barons drowns durns trones turns herons neurones carrions pereons borons bournes irons browns burans bourns gyrons mourns querns crones groins journos frons garrons prions crowns pyrones drones durions tronas turions burins girons morons churns
neuron neurone neurine aneurin