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.
gabbro gabber gabbier caber kabar cobber goober cobbier
gabbro bro bibber brow broo brio gabber biro lubber lobber nabber robber sobber dibber dobro tubber bobber vibrio fabber lowbrow hobber gibber jabber jibber jobber cobber libber fibber mobber ribber rubber dabber dobber dubber yabber