Anagrams of case: 
case
Anagrams of abcd: 
Anagrams of horse: 
horse
shore
Anagrams of officekey: 
eke icy off
eke off icy
ice key off
ice off key
icy eke off
icy off eke
key ice off
key off ice
key office
off eke icy
off ice key
off icy eke
off key ice
office key