The noun torpedo is a common noun, a word for any torpedo of any kind.
A proper noun is the name of a specific person, place, thing, or a title; for example:
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Common
It is a proper noun, because it is the name of a specific thing.
"Torpedoes" is a common noun. Common nouns are general names for people, places, things, or ideas, whereas proper nouns refer to specific names of people, places, or things. In this case, "torpedoes" is a general term for underwater missiles and does not refer to a specific, unique entity.
proper
Proper noun
it's a common noun. a proper noun would be Spider-Man.
Pencil proper or common noun
Proper noun or common noun
The noun cassette is a common noun.
a common noun?
The answer is proper noun. Examples of common noun and proper noun are: Proper noun: Mary Collins Common noun: monkey