To hoard is to save something (or lots of things) for future use. Squirrels hoard nuts for the winter. Old ladies tend to hoard canned food and used plastic bags.
People have been using the word hoard for both "to hide" and "treasure" for centuries; as both a verb and as a noun. Some hoard valuables, such as money, jewelry, and family antiques. Others build up a hoard, or cache, of things that aren't worth money but are important to them — like comic books or match books.