"a hoard of" is a perfectly valid and usable phrase in written English.
It is typically used to describe a large quantity of something, as in "the store had a hoard of candy, enough for everyone".
— but a hoard of other stuff will.
A hoard of weapons and ammunition was found at the man's home, the authorities said.
Without charisma, she contrives to shine.She starts the electoral season with a hoard of political capital.
With very little money, he had amassed in a lifetime a hoard of superb objets d'art.
By return of post she received a hoard of 100 unpublished stories.
And in the family division particularly, they present a hoard of personal drama and moral complexity.
Travel across many states no longer requires a hoard of change for tolls.
Like many civilizing influences, it has spawned a hoard of customs and protocols.
And of course I've got a hoard of displacement activities – all the things you do when you should be writing.
Here, deep within the Apex Electronics store, Laura and Kate Mulleavy are carefully excavating a hoard of insulated wires.
The eponymous count escapes his prison confines and retrieves a hoard of treasure, setting in motion his justified revenge.
