This is the 793rd most frequent Japanese word.
渋谷
Shibuya: A district in Tokyo, Japan, known for its fashion, shopping, and the famous Shibuya Crossing.
Here, '渋谷' is used as a proper noun to denote a specific location/district in Tokyo.
渋谷は東京の有名な地区です。
Shibuya is a famous district in Tokyo.
In this sentence, '渋谷駅' incorporates '渋谷' to specify Shibuya Station, connecting it to the proper noun context.
渋谷駅で友達と待ち合わせしました。
I met a friend at Shibuya Station.
'渋谷' is again the location name, denoting a reference point for distance measurement.