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.
discuss discus discs discos discase disguise disks dusks dizygous desks tusks
discuss ascus fescues fuscous viscous viscus couscous cuscus cusks miscues rescues discus