For example poultry is a collective, but what about nouns which are plural in form but singular in meaning, such as mathematics are they also considered collective nouns?
Poultry is an unmarked invariable plural noun, like people, police and cattle. They are always plural, though they have no plural ending.
Subjects like mathematics, economics, statistics are among the invariable singular nouns that happen to end in '-s'. Another in this subgrooup is news.
People are waiting to help.
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