Noun,Uncountable.Uncountable nouns are the names of
things which we cannot or usually do not count.
These nouns do not take the indefinite articles,
a and an before them;and usually they have no
plural forms.
Certain nouns are used both as countable nouns:
iron is an uncountable noun when it refers to a
particular metal.It is also a countable noun when
it is the name of the device used for pressing
clothes.Some other nouns of this class are:

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