hoarding

the practice of collecting or accumulating something (such as money or food)

something that is hoarded —usually plural

the compulsion to continually accumulate a variety of items that are often considered useless or worthless by others accompanied by an inability to discard the items without great distress

a temporary board fence put about a building being erected or repaired —called also hoard

billboard

to collect and often hide away a supply of : to accumulate a hoard of

to keep (something, such as one's thoughts) to oneself

to collect and often hide away a supply of something; specifically : to engage in compulsive hoarding