Is there a difference between a masochist and a sadist? Or perhaps masochism and sadism?

Question

Answer

masochist likes to be hurt
sadist people like to hurt someone else.

Answer

A 'sadist' is a person who gets pleasure from hurting others and from being cruel to them. 
On the contrary, a 'masochist' is a person who gets pleasure from being hurt. 
It can also be used informally when talking about a person who enjoys being in unpleasant situations.

Answer

a "masochist" is pleasured of receiving punishment, abused by others and even enjoy pain, while a 'sadist' is pleasured in giving or inflicting pain on others (that usually experiencing sexual excitement). 

I'm not sure though to those who are playing 'jack ass' if can be  considered "masochist" 

:)

Answer

yes.

masochist someone who obtains pleasure from receiving punishment

sadist someone who obtains pleasure from inflicting pain on others

cowboy...