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.
barber barberry briber bearberry bribery beriberi
barber curber robber ribier ribbier herbier crabber cribber crabbier rubber grabber grubber orbier darbar drubber shrubbery robbery rubbery gerbera arbor rubier beriberi briber bribery forbear forebear harbor ribber grabbier grubbier prober drabber durbar shrubbier
barb barbe barbie bribe bribee burb