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.
nullah null nala nill knell knoll nelly knolly nellie nielli niello nil
hallah wallah fellah challah nullah zillah mollah mullah blah walla allay selah cullay olla calla pallia holla villae cellae chalah galah bulla quillai halloa scilla hilloa holloa hulloa cella mulla villa bullae fella paella challa moolah cholla