green groceries vs solid food

green groceries and solid food both are nouns.

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

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

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

Other hypernyms of green groceries include food.

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