Yes, chosen is a Scrabble word!

Verb

1. Pick out, select, or choose from a number of alternatives

2. Select as an alternative over another

3. See fit or proper to act in a certain way; decide to act in a certain way

Noun

1. One who is the object of choice; who is given preference

2. The name for Korea as a Japanese province (1910-1945)

3. An exclusive group of people