Yes, stranger is a noun, a singular, common noun. A common noun is a word for any person, place, or thing.
A proper noun is the name of a person, place, thing, or title; for example:
proper
Yes
Proper noun
Yes
Yes.
Yes, it is a common noun, not a proper noun.
Stanley Cup is a proper noun.
Yes
Common
Common noun
Is security guard a proper noun
The noun spider is a common noun, a general word for a type of arachnid.A proper noun is the name of a specific person, place, or thing; for example, Spider-Man or the Spider House Cafe and Ballroom in Austin, TX.