(~s)
1.
If you describe someone as a ~, you mean that they are extremely wicked or cruel. (WRITTEN)
A tearful husband repeated calls for help in catching the ~ who battered his wife.
= monster
N-COUNT
2.
Fiend can be used after a noun to refer to a person who is very interested in the thing mentioned, and enjoys having a lot of it or doing it often.
...if you’re a heavy coffee drinker or strong-tea ~.
N-COUNT: n N