foodstuff vs food product

foodstuff and food product both are nouns.

Word	Noun	Adjective	Verb	Adverb
foodstuff	Yes	No	No	No
food product	Yes	No	No	No

As nouns, foodstuff and food product are synonyms defined as:

foodstuff and food product: a substance that can be used or prepared for use as food

foodstuff (noun)	food product (noun)
(usually plural) consumer goods sold by a grocer	a substance that can be used or prepared for use as food
a substance that can be used or prepared for use as food