This is the 5257th most frequent Japanese word.
高島屋
"Takashimaya" is a Japanese department store chain.
In this sentence, '高島屋' refers to the name of a well-known department store in Japan.
昨日、高島屋で買い物をしました。
Yesterday, I went shopping at Takashimaya.
Here, '高島屋' is again a proper noun referring to the famous department store.
高島屋は特に東京都で有名なデパートです。
Takashimaya is a particularly famous department store in Tokyo.
In this case, '高島屋' is used as a name being discussed in conversation, rather than directly referencing the store.