Is Pacific a noun

Answer 1

The word 'pacific' (lower case p) is an adjective, a word that describes a noun as conducive to peace, not aggressive (a pacific nation, pacific people, etc.).

The word 'Pacific' (capital P) is a proper noun , the name of a specific ocean, the "Pacific Ocean".

The word 'Pacific' (capital P) is also a proper adjective, a word that describes a noun as of or related to the Pacific Ocean (Pacific islands, Pacific fleet, etc.).

Answer 2

No, the word 'Pacific Ocean' is a noun; a proper noun; the name of a specific thing.

A pronoun is a word that takes the place of a noun in a sentence.

The pronoun that takes the place of the noun 'Pacific Ocean' is it.

Example:

The Pacific Ocean is about 17,700 km at the widest point. It is the largest ocean on Earth.