hacker

noun

• One who is expert at programming and solving problems with a computer.
• One who uses a computer to gain unauthorized access to data, or to carry out malicious attacks.
• A computer security professional.
• Something that hacks; a tool or device for hacking.
• A fork-shaped tool used to harvest root vegetables.
• Someone who hacks.
• One who is inexperienced or unskilled at a particular activity, especially a sport such as golf or tennis.

  "a tennis hacker"

• One who operates a taxicab