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.
knobblier nobbler nubblier nobler nibbler nobiliary nebular
bubblier pebblier rubblier wobblier nubblier knobblier wabblier wobbler hobbler dibbler gobbler rabbler bubbler quibbler gabbler nobbler dabbler cobbler wabbler nibbler babbler belier