storeroom
nounUK /ˈstɔːruːm/
US /ˈstɔːrruːm/
A room where you keep things until you need them.
The extra chairs are in the storeroom behind the kitchen.
OTHER MEANINGS
2. A room in a house used for keeping food, tools, or household goods.
Grandma keeps her jam jars in the cool storeroom.
3. A back area in a shop or office where extra products are kept.
The clerk went to the storeroom to find your size.
4. A place where records or supplies are kept safely for later use.
The school's storeroom holds old exam papers and sports gear.