This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A very large commercial establishment that is a combination of a department store and a supermarket.

n. a combination of department store and supermarket

n. a huge supermarket (usually built on the outskirts of a town)

"The coolest thing I saw in a hypermarket was the assistants who were dealing with price enquiries/missing barcodes at the checkouts."

supermarket