Answer: As a collective noun, the answer to this question is ‘group’. It will be referred to as a group of students. The answer can be class, crowd, and committee with the collective noun. Collective nouns are referred to the noun with an uncountable noun. Hence this type of noun is efficiently used in essays and descriptions as a form of rich English. When we talk about a class of students, you can get precise information about the classroom. Outside the school setting, a group of students will perfectly fit in the phrase as well. Activities are orgnaised by committee of students. While citing events, you can use the crowd as an appropriate collective noun.