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.
motto mott motte mot moot mood mutt matt mitt mote moat matte motey mooed moody moiety mod mut met mat mode meta modi mate meat meet maut mete mite mute mity
lotto otto potto motto ghetto chott photo dotty jotty datto cotta roto koto potty bott kotow lotte putto mott rotte motte ditto knotty tattoo petto shott