IPA: /ˈstɒkruːm/
KK: /ˈstɑkˌrum/
A room where items or materials are stored, often used in businesses to keep supplies organized and ready for use.
The manager checked the stockroom to see if there were enough supplies for the week.
Stockroom → It is formed from "stock" (from Old English *stoc*, meaning a place or a store) and "room" (from Old English *rum*, meaning space or area). A stockroom is a space designated for storing goods or supplies.
Think of a 'place' ('stoc') where items are 'stored' — that's what a stockroom is, a designated area for keeping stock.