After reading the eleventy-third iteration of this mistake in a KU story, I feel the need to vent.
A 'hoard' is a collection or supply of something. A dragon has a hoard of treasure.
- Mr. Johnson has a hoard of toilet paper in his basement.
To 'hoard' is to collect a supply of something.
- Mr. Johnson has been hoarding toilet paper for years.
A 'horde' is a large group or crowd; a swarm.
- Mr. Johnson's toilet paper was eaten by a horde of rats.
- When the store opened, a horde of hoarders raced to the toilet paper aisle, only to find the shelves empty.