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.
tomato tomatoey teammate tombed tommed timeout
tomato mat mate ramate mammati lemmata gummata commata combat comate gemmate hamate humate vomito roommate moat meat maut matt mammate numbat remate somata teammate bemata summate wombat
tom tomb tomboy tome tommy toom atma atom atomy stoma