alcohol vs liquor

alcohol and liquor both are nouns.

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

As nouns, liquor is a hyponym of alcohol; that is, liquor is a word with a more specific, narrower meaning than alcohol:

alcohol (noun)	liquor (noun)
a liquor or brew containing alcohol as the active agent	an alcoholic beverage that is distilled rather than fermented
any of a series of volatile hydroxyl compounds that are made from hydrocarbons by distillation	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