Words associated with Nouns... Collective Nouns?

[Niall]

Hi, i was wondering, in language, if there is a word for a word assiociated to a noun in the following way:

a bolt of cloth
a pane of glass
a sheet of paper

I would be tempted to call this the collective noun.
But seeing as in essence, I am not describing a group or collection of things, I don't believe that calling this the collective noun would be entirely correct.

Thanks
Niall

[Niall]

Any ideas?
Maybe there isnt even a word to describe such nouns. In which case this is gravely futile!

Thanks