The word list is absolutely copyrightable however.
Re:NYT shutting down the Wordle archive
by Wowfunhappy on Sunday March 13, 2022 @07:48PM
(#30666978)
That's not actually obvious to me—is it a creative work? I doubt Patrick Wardle manually wrote out every word in the array.
The word list of acceptable answers isn't, that's just essentially all 5 letter words. The actual answer list is a manually curated list of words (cut down from 10-15k to 2-3k), chosen to be good fun to play with.
The game concept (probably) isn't copyrightable, but the code certainly is.