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.
cribber crabber crabbier curber grabber grubber grabbier grubbier crowberry carbora crowbar corroboree
cribber ribber shrubbery drabber grubber grabbier grabber crabbier crabber bribery beriberi briber rubbery rubber robbery robber ribier ribbier grubbier drubber shrubbier
crib caribe caribou crabby scribe