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.
somitic somatic semiotic sematic semeiotic symbiotic zymotic
somitic comatic zymotic imidic semiotic sematic pneumatic neumatic nematic mimetic gametic cometic meiotic miotic hematic haematic phimotic emetic amidic semeiotic somatic symbiotic demotic
somite smit samite smite somata