Yes, CLOSE is a Scrabble word!

Letter values in Scrabble US: C 3, L 1, O 1, S 1, E 1.

Is it a valid word?

CLOSE is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

move so that an opening or passage is obstructed; make shut
become closed
cease to operate or cause to cease operating
finish or terminate (meetings, speeches, etc.)
come to a close
complete a business deal, negotiation, or an agreement
be priced or listed when trading stops
engage at close quarters
cause a window or an application to disappear on a computer desktop
change one's body stance so that the forward shoulder and foot are closer to the intended point of impact
come together, as if in an embrace
draw near
bring together all the elements or parts of
bar access to
fill or stop up
unite or bring into contact or bring together the edges of
finish a game in baseball by protecting a lead

at or within a short distance in space or time or having elements near each other
close in relevance or relationship
not far distant in time or space or degree or circumstances
rigorously attentive; strict and thorough
marked by fidelity to an original
(of a contest or contestants) evenly matched
crowded
lacking fresh air
of textiles
strictly confined or guarded
confined to specific persons
fitting closely but comfortably
used of hair or haircuts
giving or spending with reluctance
inclined to secrecy or reticence about divulging information

CLOSE was the Wordle answer on Sept. 19, 2023 (#822). Stuck on today’s? Use the Wordle helper.

Also: stopping point, closing curtain, close up, shut down, close down, come together, fill up, close-fitting, penny-pinching.

Not playable in Scrabble US: CLOSELIPPED, TIGHTLIPPED.