alcohol group vs chemical group

alcohol group and chemical group both are nouns.

Word	Noun	Adjective	Verb	Adverb
alcohol group	Yes	No	No	No
chemical group	Yes	No	No	No

As nouns, chemical group is a hypernym of alcohol group; that is, chemical group is a word with a broader meaning than alcohol group:

alcohol group: the chemical group -OH
chemical group: (chemistry) two or more atoms bound together as a single unit and forming part of a molecule

Other hypernyms of alcohol group include group, radical.

alcohol group (noun)	chemical group (noun)
the chemical group -OH	(chemistry) two or more atoms bound together as a single unit and forming part of a molecule