No. Nouns are names of people, places or things. Jon / Paris / table etc Adjectives are describing words they describe nouns. slim / black / round / etc black dog / fat man / ignorant girl / round...
The word 'word' is a singular, common noun. The word 'word' can be concrete (spoken, it's heard; written, it's seen) or abstract (as a kind word or a word to the wise).