IPA: /ˈstɪlruːm/
KK: /ˈstɪlˌrum/
A room near the kitchen used for storing drinks, preparing beverages, or keeping food items like liqueurs and preserves.
The stillroom was filled with jars of homemade jams and bottles of wine.
Stillroom → The word is formed from "still" (from Old English *stil*, meaning quiet or calm) and "room" (from Old English *rum*, meaning space or area). A stillroom is a quiet space or area, often used for storage or preparation of food and drink.
Think of a 'quiet' ('still') space ('room') where things are kept or prepared.
No commonly confused words.