grocery vs mart

grocery and mart both are nouns.

Word	Noun	Adjective	Verb	Adverb
grocery	Yes	No	No	No
mart	Yes	No	No	No

As nouns, mart is a hypernym of grocery; that is, mart is a word with a broader meaning than grocery:

Other hypernyms of grocery include market, market place, marketplace.

grocery (noun)	mart (noun)
a marketplace where groceries are sold	an area in a town where a public mercantile establishment is set up
(usually plural) consumer goods sold by a grocer