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.
cloture culture clouter cloudier kultur colter coulter clutter clowder gloater clatter cluttery colluder clattery collator cloddier colder kelter kilter caldera glitter quilter
cloture filature vulture culture multure
clot calotte cloot clotty cloud cloudy clout culotte