This is the 5066th most frequent Japanese word.
西友
Seiyu: A Japanese supermarket chain.
Uses '西友' to refer to a specific retail store.
西友はそこのスーパーです。
Seiyu is the supermarket there.
Uses '西友' as the location where the action occurs, indicating a chain of stores.
西友で日本の食品を買いました。
I bought Japanese food at Seiyu.
Uses '西友' to indicate proximity to a known landmark.