uranyl radical vs uranyl group

uranyl radical and uranyl group both are nouns.

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

As nouns, uranyl radical and uranyl group are synonyms defined as:

uranyl radical and uranyl group: the bivalent radical UO2 which forms salts with acids

Other synonyms of uranyl radical include uranyl.

uranyl radical (noun)	uranyl group (noun)
the bivalent radical UO2 which forms salts with acids	the bivalent radical UO2 which forms salts with acids