What do you call a person who uses others?

What do you call a person who uses others?

exploiter. An exploiter is a user, someone who takes advantage of other people or things for their own gain.

What do you call a person who always helps others?

altruistic. Someone who is altruistic always puts others first. This word comes from the Old French altruistic and means "other people" and before that the Latin alter, which means "other." Our current word comes from the nineteenth century and comes from philosophy.

What do you call someone who takes credit for someone else’s work?

According to the Merriam-Webster online dictionary, to "plagiarize" means: to steal and pass off (the ideas or words of another) as one's own. to use (another's production) without crediting the source.