vinyl radical vs chemical group

vinyl radical and chemical group both are nouns.

Word	Noun	Adjective	Verb	Adverb
vinyl radical	Yes	No	No	No
chemical group	Yes	No	No	No

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

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

Other hypernyms of vinyl radical include group, radical.

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