Sadism:
-The deriving of sexual gratification or the tendency to derive sexual gratification from inflicting pain or emotional abuse on others.
-The deriving of pleasure, or the tendency to derive pleasure, from cruelty.
-Extreme cruelty.

Sadist:
-someone who obtains pleasure from inflicting pain or others.

Opposite: Masochist

Masochism:
-The deriving of sexual gratification, or the tendency to derive sexual gratification, from being physically or emotionally abused.
-The deriving of pleasure, or the tendency to derive pleasure, from being humiliated or mistreated, either by another or by oneself.
-A willingness or tendency to subject oneself to unpleasant or trying experiences.

Masochist:
-someone who obtains pleasure from receiving punishment.

Im most likely both lol cause i like giving and reciving pain... most of the time lol