Quiet is a related term of somber.
As adjectives the difference between quiet and somber
is that
quiet is with little or no sound; free from of disturbing noise while
somber is dark or dreary in character; joyless, and grim.
As verbs the difference between quiet and somber
is that
quiet is to become quiet, silent, still, tranquil, calm while
somber is .
As a noun quiet
is the absence of sound; quietness.