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.
deer doer dere dree dear deray deary deair derry dearie dry dor drew dura dore duro tier dare dire dory doughier dorr draw door dour tree dray tear durr dure dairy terra terai durra teary doura diary dowry terry hydra hydro
beer veer jeer queer leer peer seer deer weer cheer sheer er