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.
whirr whirry whir wirra wherry wire wiry weir wair whore where worry war ware wary waur wear weer were wore
whirr chirr shirr doughier birr firry hair heir hire cirri shier sirra whir chirre wirra chair charr chiro chiru churr shire whirry choir yirr