What a noun and pronoun

noun- a member of a class of words that can function as the subject or object in a construction, are often formally distinguished, as by taking the plural and possessive endings, and typically refer to persons, places, animals, things,

pronoun. : any of a small set of words in a language that are used as substitutes for nouns or noun phrases and whose referents are named or understood in the context.

Explanation:

This was the first definition i was thought  and i still stick with it .

I hope it helps :)

A noun is a naming word

A pronoun is a group of words that can be used to replace nouns in sentences to avoid repetitions

Explanation:

are you kidding? from that description of two mansions, you can't figure out which one is bleak and desolate? maybe you should consider looking those words up in a dictionary, if you don't know what they mean already.