foodstuff vs grocery

foodstuff and grocery both are nouns.

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

As nouns, foodstuff and grocery are synonyms defined as:

foodstuff (noun)	grocery (noun)
(usually plural) consumer goods sold by a grocer	a marketplace where groceries are sold
a substance that can be used or prepared for use as food	(usually plural) consumer goods sold by a grocer