green groceries vs food

green groceries and food both are nouns.

Word	Noun	Adjective	Verb	Adverb
green groceries	Yes	No	No	No
food	Yes	No	No	No

As nouns, food is a hypernym of green groceries; that is, food is a word with a broader meaning than green groceries:

green groceries: fresh fruits and vegetable grown for the market
food: any solid substance (as opposed to liquid) that is used as a source of nourishment

Other hypernyms of green groceries include solid food.

green groceries (noun)	food (noun)
fresh fruits and vegetable grown for the market	any substance that can be metabolized by an animal to give energy and build tissue
	anything that provides mental stimulus for thinking
	any solid substance (as opposed to liquid) that is used as a source of nourishment