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.
discs discos discus discase discuss disks disguise desks dusks dizygous towsacks tussocks tussucks tsks
fiscs discs disks fiascos musics mosaics cusecs cuscus cosecs viscus physics piscos sacs basics ascus sics secs risks discos bisks ciscos discus whisks