Is the word 'they' a noun?
No, the word 'they' is a pronoun, a word that takes the place of
a noun in a sentence.
The pronoun 'they' is a personal pronoun, the third person,
plural, subjective. The pronoun 'they' takes the place of a plural
noun, or two or more nouns as the subject of a sentence.
The boys will be home any minute and they will
want some lunch.
Jim, June, and the boys are coming for lunch. They
will be here at one.