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A group of monumental stones is called a henge of stones. A mound of stones is called a cairn of stones. Other, more general collective nouns can also be used, such as a pile of stones, a row of stones, a truckload of stones, etc.
A collective noun is used to refer to a group of people or things. The opposite of a collective noun is a countable noun. If I say there is a flock of birds, you really don't know how many I mean...
Depends on your definition of 'collective noun.' If you mean a plural noun, the most common way is to ad an S to the end. A true collective noun, however, is unique to each situation and you just...
Collective nouns are words for a group of like nouns. Examples: A flock of sheep. A stable of horses A troop of monkeys A troupe of actors A panel of experts A crowd of onlookers A fleet of cars A...