Network
Abstract nouns: No
Notes is not an abstract noun because we can see and touch it.
2. Knowledge
Abstract nouns: Yes
Knowledge is facts, information, and skills acquired by a person through experience or education; the theoretical or practical understanding of a subject.
It is an abstract noun because we cannot see, touch, taste, smell, or hear.
3. Methods
Abstract nouns: Yes
Method is a particular form of procedure for accomplishing or approaching something, especially a systematic or established one.
