Is school a concrete noun

The noun 'school' is a concrete noun as a Word for a place that people go to learn; a Word for the students and/or teachers of such a place; a Word for a group of fish; a Word for a physical place; a physical group of people or things.
The noun 'school' is an abstract noun as a Word for the process of being educated formally; a theoretical group of people who share the same opinions, beliefs, or methods; a Word for a concept.

The Word 'school' is also a verb: school, schools, schooling, schooled.