emporium vs retail store

emporium and retail store both are nouns.

Word	Noun	Adjective	Verb	Adverb
emporium	Yes	No	No	No
retail store	Yes	No	No	No

As nouns, retail store is a hypernym of emporium; that is, retail store is a word with a broader meaning than emporium:

emporium: a large retail store organized into departments offering a variety of merchandise; commonly part of a retail chain
retail store: a place of business for retailing goods

Other hypernyms of emporium include mercantile establishment, outlet, sales outlet.

emporium (noun)	retail store (noun)
a large retail store organized into departments offering a variety of merchandise; commonly part of a retail chain	a place of business for retailing goods