The book was lying on the table. Here the word 'book' is-

Which one is in abstract noun? Shahed did not join the army. Here the word army is- The principal took the round in the college. Here 'Round' is a/an- Which one is a collective noun? A herd of cattle is passing. The underlined word is a/an- Identify the word that remains same in plural form: 'Frequency' is- Happiness is a------- The plural form of thesis is - Which of the following word is collective noun?