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.
mullein mullen mullion moulin million milline millennia malign maline melena moline melon
gallein villein mullein zillion relleno pollen oleine mullion billion bullion fallen villain hellion colleen jillion cullion galleon milline million mullen olein pillion ralline sullen woollen lin
mulley mule mull mallee mallei mille muley mulla mullah