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.
discus discuss discs discos discase disks disguise dizygous desks dusks towsacks
ascus discus cuscus viscus discos fiascos suqs rescues basics musics sacs cusecs secs sics viscous fuscous fiscs cosecs couscous fescues miscues piscos ciscos discs physics suks discuss