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.
greenness greyness greenies greens goriness grayness grannies queerness careens gurneys groynes crannies grans grins guaranies groans kernes cranes groins grains crones cronies garrons carnies carneys corneas guaranis guaranas corneous carns corns curns karns kerns kirns
barrenness greenness wornness bareness brownness freeness ironness greyness queerness moreness lornness pureness rareness soreness sureness direness trueness sheerness