Can you give me uncountable nouns with countable meanings?
Some nouns refering to material can be used in both countable and uncountable meaning.
When you speak of a material you use it in uncountable meaning:
I bought some paper to write a letter.
But it can also be used as a countable noun when refering to a newspaper:
I went to a shop to buy a paper.
You can use it as the name of material and thn it is an uncountable noun.
Much glass was used to make those windows.
But you can also use it as a countable noun:
I drank a glass of wine during the dinner.