Is City Science Center a pronoun?

Answer 1

No. In the words City Science Center, city and science are both nouns being used as adjectives. The word center is the main noun. If you were to say:

"The city science center is cool." you could see that center is both the simple predicate and the subject noun.

City Science Center is a proper noun.

Pronouns are words: I, you, he, she, we, us, you all, they, it, etc.

Pronouns are use in the place of nouns.

Proper nouns gives the names of people, places and things.

For ex:

John went to the movies with Zoey. John and Zoey had an amazing time.

instead of using John and Zoey's name twice you could say:

John went to the movies with Zoey. They had an amazing time.