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.
browns brownies borons brawns barons brownnose brownness barns brans burns brens brins baronnes brionies baronies baroness burins bairns bronzy bronze brines bourns burans brains bruins boreens barrens burnous barneys bournes brinies boranes burnies byrnies bareness birianis burnoose beeriness barrenness
frowns drowns crowns browns tronas roans virions herons neurons morrions morns marrons kroons frons crones turions porns heroins barons pereions perrons prawns pyrones diurons brawns horns groans morions pereons drones carrions borons prions croons maroons hyperons neurones coronas trones sorns durions morons girons gyrons groins irons garrons corns irones chorions
brownie brown browny baron baronne barony boron brawn brawny briony