Question

Is flock an abstract noun

Answer 1

'flock' is a singular, common, concrete noun; a word for a group of sheep, birds, or followers.

The noun 'flock' is also used as a collective noun, for example, a flock of pigeons.

Answer 2

Abstract nouns are nouns you cannot see, hear, smell, taste, or touch.

So yes, I believe 'flock' is an abstract noun.