arsenic group vs chemical group

arsenic group and chemical group both are nouns.

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

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

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

Other hypernyms of arsenic group include group, radical.

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