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"mortal enemy" is correct and usable in written English.
You can use it to refer to a person or group that is considered a bitter and formidable enemy. For example, "The two countries had been mortal enemies for years before they signed a peace treaty."
Exact(53)
Your mortal enemy, Lagarde".
Absolutism is innovation's mortal enemy.
He made such nationalism his mortal enemy.
Then he's attacked by his mortal enemy: the fox.
Fringe, in the Roomba universe, is a mortal enemy.
It's the same fight against the same mortal enemy.
"They feared that he was their mortal enemy".
Similar(4)
"They used to be mortal enemies.
She leaves behind many friends and a few mortal enemies.
Granada's long coastline offered an open frontier to the Ottoman Turks, Spain's mortal enemies.
Arab armies cannot keep up.To be sure, Israel still has lots of mortal enemies.
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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