firewater vs liquor

firewater and liquor both are nouns.

Word	Noun	Adjective	Verb	Adverb
firewater	Yes	No	No	No
liquor	Yes	No	No	No

As nouns, liquor is a hypernym of firewater; that is, liquor is a word with a broader meaning than firewater:

Other hypernyms of firewater include booze, hard drink, hard liquor, John Barleycorn, spirits, strong drink.

firewater (noun)	liquor (noun)
any strong spirits (such as strong whisky or rum)	an alcoholic beverage that is distilled rather than fermented
	the liquid in which vegetables or meat have been cooked
	a liquid substance that is a solution (or emulsion or suspension) used or obtained in an industrial process