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.
philtre philtra philter filature filter vulture violater violator falter fluter fleeter flitter floater flouter flutter vaulter fielder flatter
philtre litre filter philter philtra vulture haltere jilter culture kilter quilter milter multure saltire tilter