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.
plumber plumbery plumier plummer plumeria plummier palmer palmier polymer palmar palmary palmyra
clumber plumber slumber lumber glummer slumbery plummer plumier plumbery lumbar climber clamber limbier limber lambier lamber slummer