Exxon is a proper noun
The singular possessive noun is Rex's.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Unless you are using it in a proper noun form, such as "My dog's name is Tyrannosaurus Rex" or "The park is called The T-Rex Playground", it should not be capatalized. It is like the word 'dog'; it names a species, not a specific thing.
Pencil proper or common noun
proper noun
Yes, the word 'Ali' is a proper noun, the name of a person.A proper noun is the name or title of a specific person, place, or thing.A proper noun is always capitalized.
proper noun
Proper noun
if you are talking about if it is a common noun or a proper noun, it is a proper noun.
It is a proper noun, because it is the name of a specific thing.
what is trix