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.
chirr chirre choir chiru shirr chiro churr chair charr charry cherry churro charro char chary chare chore shier shire cheer cheero cheery chorea sherry cheerio shri
whirr chirr shirr doughier birr firry hair heir hire cirri shier sirra whir chirre wirra chair charr chiro chiru churr shire whirry choir yirr