The difference between Collective noun and Mass noun
When used as nouns, collective noun means a noun which, though singular, refers to a group of things or animals. examples: a school of fish, a pride of lions, whereas mass noun means a noun that normally cannot be counted.
check bellow for the other definitions of Collective noun and Mass noun
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Collective noun as a noun (grammar):
A noun which, though singular, refers to a group of things or animals. Examples: a school of fish, a pride of lions.
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Mass noun as a noun:
A noun that normally cannot be counted.
Examples:
"synonyms: material noun non-count noun [[uncountable]] noun"
"ant [[countable]] noun count noun"