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.
grayness greyness groynes grans grannies goriness cranes grains groans greenness guaranies gurneys guaranis greenies guaranas crannies grins queerness kernes groins greens crones corneas cronies carneys garrons carnies currans corneous corns kirns curns karns kerns carns cairns cornus croons crowns kroons querns
wryness grayness greyness dryness groynes weariness beeriness tarriness sureness hairiness pureness nearness moreness merriness barrenness cheeriness wornness leeriness ironness greenness hoariness baroness soreness sourness dearness dourness goriness trueness airiness narrowness wiriness direness teariness farness brownness lornness rareness poorness fairness rawness wariness chariness bareness eeriness sorriness queerness furriness harness freeness fieriness miriness sheerness
gran grain grainy grana grannie granny groan groyne