potable vs food

potable and food both are nouns.

Word	Noun	Adjective	Verb	Adverb
potable	Yes	Yes	No	No
food	Yes	No	No	No

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

potable: any liquid suitable for drinking
food: any substance that can be metabolized by an animal to give energy and build tissue

Other hypernyms of potable include nutrient, liquid.

potable (noun)	food (noun)
any liquid suitable for drinking	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

potable (adjective)	food (adjective)
suitable for drinking