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.
metro meter metre meeter meteor metier meatier mater muter motor miter mitre matter mooter matier mudder mitier maduro madder mutter madeira mattery moodier muddier
metro retro tetri teeter deter strow retry peter troy poetry pedro nitro tiro toro trio trow outrow tyro foetor fetor hetero cuatro quieter meeter meter metre taro stereo stroy dieter tetra sheeter