Yes, sector is a Scrabble word!

Noun

1. A plane figure bounded by two radii and the included arc of a circle

2. A social group that forms part of the society or the economy

3. A particular aspect of life or activity

4. The minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes

5. A portion of a military position

6. Measuring instrument consisting of two graduated arms hinged at one end