How many types of unit nouns? Briefly explain them.

How many types of unit nouns? Briefly explain them.

Unit nouns can be divided into the following types:
(1) Unit nouns referring to the shapes of objects: a cake of ice
(2) Unit nouns referring to the ways in which things are put together: a bunch of flowers
(3) Unit nouns referring to groups of people: a group of children
(4) Unit nouns referring to groups of animals: a swarm of ants
(5) Unit nouns referring to measurement: a gram of flour
(6) Unit nouns referring to containers: a jar of strawberry jam
(7) Unit nouns referring to manners, states, etc.: a roll of thunder
(8)Nouns like type, sort, kind, species, class, variety can divide nouns into “types”, or “species”: Teak is a kind of wood.