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.
shoulder shielder shelter
boulder moulder aulder shoulder moldier poulter solder mouldier older elder collider alder builder milder welder bowlder killdeer wilder cloudier coulter gilder holder folder fielder eluder wielder golder caldera vaulter solider gelder bolder colder colluder balder blader molder melder guilder lader glider louder lauder bouldery moulter polder slider soldier deluder welldoer wieldier shielder yielder
should shauled shoaled shooled