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.
million milline mullion mullein melon millennia malign maline moline moulin mullen melena
billion pillion bullion million cullion jillion mullion zillion hellion lion mullein talion galleon solion ballon villain bouillon ralline billon galloon balloon gallon gallein villein milline shalloon lin
mill maill milia milieu mille mollie mil