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.
libeler libeller labeler labeller lobular
labeler libeler bubblier belier bubbler babbler abler bluer feebler blear nobbler nubblier rabbler dabbler dibbler wabbler wobbler knobblier baler cabler nibbler gabbler gobbler quibbler labeller hobbler fabler libeller cobbler nobler pebblier rubblier diablery doubler wabblier wobblier
libel libelee libellee label labella liable lobelia alible glibly