benzoyl group vs chemical group

benzoyl group and chemical group both are nouns.

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

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

benzoyl group: the univalent radical derived from benzoic acid
chemical group: (chemistry) two or more atoms bound together as a single unit and forming part of a molecule

Other hypernyms of benzoyl group include group, radical.

benzoyl group (noun)	chemical group (noun)
the univalent radical derived from benzoic acid	(chemistry) two or more atoms bound together as a single unit and forming part of a molecule