No, the noun 'child' is singular, a word for one person.
The noun 'children' is the plural noun, a word for two or more people.
A collective noun is a noun used to group people or things in a descriptive or a fanciful way.
The collective nouns for a group of children are:
Chat with our AI personalities
Shoal is a collective noun. It is the collective noun for fish. A shoal of fish.The collective noun is a mint of candies
No, the noun farm is not a collective noun.
No it is not a collective noun.
There is no standard collective noun for a group of reflections. The noun 'reflection' is not a standard collective noun.
No, the noun lumber is not used as a collective noun. The collective noun for lumber is a stack of lumber.