closed vs closed in

closed and closed in both are adjectives.

Word	Noun	Adjective	Verb	Adverb
closed	No	Yes	No	No
closed in	No	Yes	No	No

As adjectives, closed and closed in are synonyms defined as:

closed (adjective)	closed in (adjective)
not open or affording passage or access	blocked against entry
(set theory) of an interval that contains both its endpoints
used especially of mouth or eyes
not open
blocked against entry
not open to the general public
with shutters closed
requiring union membership
not having an open mind