Unfortunately, no, but you can use okay.
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A Scrabble word is an English word that you can use in the Scrabble game.
OK is not in the "Official Scrabble Players Dictionary" so I guess not.
No. Arq is not a legal Scrabble word.
By the Game rules, No. Abbreviations are not normally allowed in Scrabble. But that all depends on who you are playing with.
The game ends when all the letter tiles of a player (the first to finish) are exhausted/used/played on the scrabble board.