i Register
In some senses, armoury is marked as UK. Watch for register when choosing this word.
noun
A place where arms are kept, an arsenal.
A collection of weapons and materiel.
A place where arms are made.
The manufacture of armour and arms; arming, armouring.
(1.) *Armorist. n. s. [from armour.] A person skilled in heraldry. Dict. (2.) Armorist, signifies also a person skilled in armory.
He replied that he intended to pass through there to his own land, since he could not go by sea {because of the Turks}, and the ambassador was going in order, if he could find a way, to bring back some craftsmen skilled in armoury and[…]
Heraldry.