In the book Collins cobuild articles:
The table in 2.1 shows that there are nouns like ‘cake’ which can be count nouns or uncount nouns. When using these nouns, you can either consider the thing you are talking about as a substance, or as an individual object. If you consider it a substance, you use an uncount noun: ‘cake’; if you consider it an object, you use a count noun: ‘a cake’
We had cake for supper.
The flavour of a Christmas cake will be greatly improved if the cake is sprinkled with rum or brandy before storing.
Welcome to the forums Xcislav. Did you have a question or were you just sharing knowledge?
Not just, not share. Answer please. And don’t delete post like “the supremest administration” of wordreferenceforums have done. Thanks for an attempt to answer.
I would like to help but I can’t work out your question because you have already explained in your first message how cake can be thought of as plural:
If cake = uncountable, then the only form - singular and plural - is ‘cake’.
The tin was filled to the brim with cake. (This could be an individual number of small cakes, however as a whole we can describe the tin as being full of cake).
If cake = countable, then the plural form is ‘cakes’.
The tin was filled to the brim with cakes. (This time, it is obvious that we are talking about individual cakes.)