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.
baroness baronnes bareness baronies barons brownness barneys barrenness barns brownies brionies bronze browns borons bairns brines beeriness brinies bournes burnies boranes barrens byrnies burns brins brens brans brownnose bruins burins bronzy brains bourns brawns burans boreens burnous birianis burnoose
baroness rawness moreness merriness nearness greenness groynes goriness pyrones poorness soreness ironies crones harness dearness hoariness sourness dourness wryness dryness airiness teariness furriness trueness baronies weariness baronnes wornness bareness cheeriness leeriness barrenness beeriness heroines miriness lornness narrowness grayness greyness cronies pureness neurones rareness irones ironness hairiness sureness sorriness brionies direness fieriness drones farness tarriness freeness trones eeriness wariness brownness wiriness fairness chariness queerness sheerness
baron baronne barony barn bairn barney barny boron briony brown brownie browny