Yes, cage is a Scrabble word!

Verb

1. Confine in a cage

Noun

1. An enclosure made or wire or metal bars in which birds or animals can be kept

2. Something that restricts freedom as a cage restricts movement

3. United States composer of avant-garde music (1912-1992)

4. The net that is the goal in ice hockey

5. A movable screen placed behind home base to catch balls during batting practice