No, the noun jacket is a singular, common, concrete noun; a word for a piece of clothing; a word for a thing.
A collective noun is a word used to group nouns, for example a rack of jackets, a closet of clothing, etc.
The noun 'year' can be used as a collective noun, for example a year of unexpected events, a year of disasters, etc. A noun used as a collective noun is not an inherent quality of the noun, a collective noun is determined by the use of the noun. We use the noun 'bunch' as a collective noun, a bunch of grapes, a bunch of bananas; but "He stuffed his jacket in a bunch into his locker." is not using 'bunch' as a collective noun, it is simply the object of the preposition 'in'; or the example of a table of contents, and "Put the books on the table.", one use of the noun 'table' is a collective noun and one is not. It is true that some nouns lend themselves to use as a collective noun and some are so commonly used as to be the accepted as the standard as a collective noun. Simply, a collective noun is a noun used to group two or more people or things in a descriptive way.
Shoal is a collective noun. It is the collective noun for fish. A shoal of fish.The collective noun is a mint of candies
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.
No, the noun farm is not a collective noun.
The noun 'year' can be used as a collective noun, for example a year of unexpected events, a year of disasters, etc. A noun used as a collective noun is not an inherent quality of the noun, a collective noun is determined by the use of the noun. We use the noun 'bunch' as a collective noun, a bunch of grapes, a bunch of bananas; but "He stuffed his jacket in a bunch into his locker." is not using 'bunch' as a collective noun, it is simply the object of the preposition 'in'; or the example of a table of contents, and "Put the books on the table.", one use of the noun 'table' is a collective noun and one is not. It is true that some nouns lend themselves to use as a collective noun and some are so commonly used as to be the accepted as the standard as a collective noun. Simply, a collective noun is a noun used to group two or more people or things in a descriptive way.
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.
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.
No it is not a collective noun.
The collective noun is a series of explosions.
No, games is not a collective noun. The collective noun for games is 'a compendium of games'.
The collective noun is an anthology of poetry.
No, the noun land is not a collective noun. However, any noun can function is as a collective noun in a suitable context without being a designated collective noun.
The collective noun for 'wheat' is a sheaf of wheat.The collective noun for 'barley' is a crop of barley.
The collective noun is a drift of icebergs.