uranyl vs chemical group

uranyl and chemical group both are nouns.

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

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

uranyl: the bivalent radical UO2 which forms salts with acids
chemical group: (chemistry) two or more atoms bound together as a single unit and forming part of a molecule

Other hypernyms of uranyl include group, radical.

uranyl (noun)	chemical group (noun)
the bivalent radical UO2 which forms salts with acids	(chemistry) two or more atoms bound together as a single unit and forming part of a molecule