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.
were where weir wire wore weer wear ware whore weary wooer wherry war wair wary waur whir wiry whirr wirra worry
ere fere here quaere mere pere cere sere dere were where re er