Crew is a noun that refers to a group of people working together, especially in a particular activity or for a special purpose.
Common usages of crew include:
1. The people who work on a ship, aircraft, etc.
2. A group of people who work together, especially in a particular activity
3. In sports, a team of rowers
4. In slang, a group of friends or associates
5. In fashion, a type of neckline (crew neck)