No, the noun "firefighter" is a common noun; a general word for a person whose job is to extinguish fires; a word for any firefighter.
A proper noun is the name or title of a specific person, place or thing; for example, the Fallen Fire Fighter Memorial Monument in Colorado Springs, CO or the Museum of Firefighting in Hudson, NY.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
It is a proper noun, because it is the name of a specific thing.
proper
Proper noun
it's a common noun. a proper noun would be Spider-Man.
Firemen is a common noun. A proper noun would be the name of a specific fireman, like if you knew a fireman named Dan.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
It is a proper noun, because it is the name of a specific thing.
The generic or common gender noun is fire fighter.
proper
Proper noun
Pencil proper or common noun
it's a common noun. a proper noun would be Spider-Man.
Proper noun or common noun
The noun cassette is a common noun.
a common noun?
Camel is a common noun.