User
Part of speech: noun
Definition: One who uses or makes use of something, a consumer. A person who uses drugs, especially illegal drugs. A person who uses a computer or a computing network, especially a person who has received a user account. An exploiter, an abusive user (a person who uses something or someone unfairly, selfishly and/or unethically).
Example sentence: When designers replaced the command line interface with the graphical user interface, billions of people who are not programmers could make use of computer technology.
Exploiter
Part of speech: verb
Definition: To make use of.
Part of speech: noun
Definition: One who exploits.