Yes, school is a Scrabble word!

Verb

1. Educate in or as if in a school

2. Teach or refine to be discriminative in taste or judgment

3. Swim in or form a large group of fish

Noun

1. An educational institution

2. A building where young people receive education

3. The process of being formally educated at a school

4. A body of creative artists or writers or thinkers linked by a similar style or by similar teachers

5. The period of instruction in a school; the time period when school is in session

6. An educational institution's faculty and students

7. A large group of fish