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.
er ear era ere err aero aery eery euro eyra eyre eyry aerie eerie eyrie
beer cooer deer suer seer ruer hyper per queuer leer queer kier gooier goer cheer weer shier doughier jeer bier lier tier doer zooier ser wrier peer pier hoer er fer veer vier her sheer wooer shoer