Yes, the word 'author' (authors) is a noun and a verb (author, authors, authoring, authored).
Examples:
This is the third best seller for this author. (noun)
He will author the history of the settlement. (verb)
Authorities is a plural noun.
Civil is an adjective. civil authorities - adjective + noun civil liberties - adjective + noun
Yes, the word 'noun' is a noun, a word for a thing.
Yes, the word 'noun' is a noun, a word for a thing.
The word 'word' is a singular, common noun; a word for a thing.The noun 'word' is a concrete noun when spoken, it can be heard and when written, it can be seen.The noun 'word' is an abstract noun as in a kind word or a word to the wise.
The noun 'noun' is an abstract noun, a word for a concept.
The noun 'justice' is a concrete noun as a word for a judge or a magistrate, a word for a person.The word 'justice' is an abstract noun; a word for a quality of fairness and reason; a word for a concept.
The word 'noun' is not a verb. The word 'noun' is a noun, a word for a thing.
Yes the word classroom is a noun. It is a common noun.
The word 'teacher' is a noun, a singular, common, concrete noun; a word for a person.
A word is a thing. The word 'word' is a noun.
Yes, the word 'Claire' is a noun, a proper noun, the name of a person.A noun is a word for a person, a place, or a thing. The noun 'Claire' is a word for a person.