Hello,
The word "Everywhere" is NOT a common noun.
My Explanation: My reason to why I say that "Everywhere" is NOT a common noun is because a noun HAS to be specific. A common noun is a; Person,place,or even a thing. "Everywhere" is a little tricky. But the points of a noun has to be specific. For example: Ice Skating, The Mall, The Prison, The House, Cats, Cows, Laptop, Those are Common nouns. The word "Everywhere" is NOT a common noun.
Hope this helps
-HotTwizzlers