Is teams a concrete or an abstract noun?

Answer 1

The plural noun 'teams' is an abstract noun, a word for a group of people or animals joined in a common activity.

Answer 2

The proper noun 'The Packers' is a concrete noun, the name of a physical group of people.

Answer 3

Yes, the noun 'team' is a concrete noun, a word for a physical thing: a team of players, a team of mules, a team of dolphins, etc.