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.
mattrass matrass mattress matters madrassa madras maters matres madrassah mutters matures madrasa madrasah madeiras meters madres mudras metros mitres motors miters metres madders maduros meeters meteors metiers midairs mooters motorise
trass matrass strass mattrass nutrias tuateras mattress tetras madrassa sutras buttress strays latrias betrays sataras votress toras straws yttrias stress truss daturas tress tuataras trays waitress
mater matter mattery mature smatter