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.
galloon gallon galleon gallein gluon galena callan cullion glen clon clown colon clone glean colone coloni colony kalian kaolin cauline colleen guyline kaoline
galloon balloon shalloon loon cullion billon zillion pillion loony ballon billion hellion bouillon saloon galleon gallon million mullion jillion bullion