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.
discos discs discus discase discuss disks disguise desks dusks desoxy dizygous towsacks tussocks tussucks
fiascos ciscos piscos discos ascus discs cusecs roscoes couscous musics cuscus cosecs scows secs sickos sics askos fiscs fuscous physics viscose viscous viscus sacs ciscoes fiascoes basics discus