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The phrase "room key" is correct and usable in written English.
You can use it when you are referring to the key for a particular room, for example: "I don't have my room key, so I can't get into my hotel room."
Exact(57)
Serve with a hotel room key.
His room key card may be useful as evidence.
She slid John's room key across the counter.
Finally, we were given a room key card.
Then she noticed a poster in Alison's room: "Key West".
All he wanted was his room key, number 642.
Many suggestions are related to improving how room key cards work, Mr. King said, laughing.
(As a handy by-product, you can't misplace your room key, either).
The card is also your room key, and a charge account if you so choose.
The room key is on the dresser; she leaves it there.
The next day, a visiting English worker at the hotel gave them his room key.
More suggestions(5)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com