emporium vs sales outlet

emporium and sales outlet both are nouns.

Word	Noun	Adjective	Verb	Adverb
emporium	Yes	No	No	No
sales outlet	Yes	No	No	No

As nouns, sales outlet is a hypernym of emporium; that is, sales outlet 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
sales outlet: a place of business for retailing goods

Other hypernyms of emporium include mercantile establishment, outlet, retail store.

emporium (noun)	sales outlet (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