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.
glibber globbier caliber clabber clobber clubber clubbier calibre kilobar
glibber libber slobbier slobber slabber liber lobber lubber blabber blubber blubbery flubber flabbier caliber clabber clobber clubber clubbier globbier slabbery slobbery slubber