Uncountable nouns (example “milk”, “flour”, “water”) do not have a plural form. The singular form of a countable noun is used to describe one unit of it.

Is flour a countable noun?

Uncountable nouns are materials, concepts, etc. which are not individual objects and cannot be counted. information, water, wine, flour, cheese, etc. Uncountable nouns are always singular.

What type of noun is flour?

flour used as a noun:

powder obtained by grinding or milling cereal grains, especially wheat, and used to bake bread, cakes, and pastry. powder of other material, e.g., wood flour produced by sanding wood.