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.
causality casualty gaslit cassoulet caseload
nasality causality salty slitty fissility visuality casualty sessility salt slit
causal causally casual casually