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.
greenies greens greenness greyness grannies guaranies carnies careens groynes cronies grayness guaranis crannies goriness grans grins queerness groans kernes groins crones cranes grains garrons cornice gurneys guaranas carns kirns curns corns kerns karns cairns cornus croons crowns kroons querns
greenies byrnies ternes sureness serenes pyrenes moreness arenes cronies kernes crannies carnies gyrenes ironies freeness trueness trannies ernes burnies liernes trienes terrenes direness soreness rareness pureness guaranies renews grannies bareness baronies brinies brionies brownies tyrannies