chocolate vs solid food

chocolate and solid food both are nouns.

Word	Noun	Adjective	Verb	Adverb
chocolate	Yes	No	No	No
solid food	Yes	No	No	No

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

chocolate: a food made from roasted ground cacao beans
solid food: any solid substance (as opposed to liquid) that is used as a source of nourishment

Other hypernyms of chocolate include food.

chocolate (noun)	solid food (noun)
a medium brown to dark-brown color	any solid substance (as opposed to liquid) that is used as a source of nourishment
a food made from roasted ground cacao beans
a beverage made from cocoa powder and milk and sugar; usually drunk hot