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.
clattery clatter cluttery clutter glittery colter clouter gloater coulter glitter coleader collator kilter colder kelter gladder culture gladier cloture caldera clowder quilter caldaria cloddier colluder gleetier guiltier cloudier collider gauleiter glider golder kultur
littery glittery cluttery fluttery flattery lottery clattery blatter blottier platter flitter plottier clutter slitter lotter slotter flutter letter blotter glitter latter litter plotter clatter reletter allotter slittier flatter sluttier