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Something used in a place of another thing is a substitute.
Mountains. We use the term "divide" to mean the place on a mountain or ridge that separates two directions of water flow.
A namesake is when a person, place, or thing is named after another person, place, or thing.
Example synonyms for something used in place of another thing are: substitute surrogate proxy stand-in replacement representative
A line where one place or thing starts And another ends. The line between states
marker
place
replace
a person or thing acting in place of another
ellipses
I think the answer is "smarter." A person, place, or thing (noun) is "smarter" than another person, place or thing (noun).
They are a panel that is a thing that they transport you to another place.