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.
fiascos fiascoes fiscs fuscous viscose viscous viscus fescues
fiascos scows ascus askos basics fiascoes fuscous viscose viscous couscous piscos roscoes ciscoes ciscos discos