benzyl group vs chemical group

benzyl group and chemical group both are nouns.

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

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

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

Other hypernyms of benzyl group include group, radical.

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