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close
vs
closed

As an adjective close means nearby.

For example: She stood close to the exit so that it would be easy to leave at the end of the concert.

As a verb to close means to shut.

For example: At the beginning of the performance the ushers close all the doors.

Closed is an adjective that means not open.

For example: The doors were closed.

!Note - See also close (pronunciation)