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strange
vs
stranger

Strange is an adjective used to describe something as unusual or surprising in a way that is unsettling or hard to understand.

For example: She had a very strange accent.

Stranger is a noun used to describe a person whom one does not know or with whom one is not familiar.

For example: A stranger is only someone you haven't met yet.

 

!Note - The adjective "strange" becomes "stranger" in the comparative form, as in "Truth can be stranger than fiction".