vinyl vs vinyl group

vinyl and vinyl group both are nouns.

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

As nouns, vinyl and vinyl group are synonyms defined as:

vinyl and vinyl group: a univalent chemical radical derived from ethylene

Other synonyms of vinyl include vinyl radical.

vinyl (noun)	vinyl group (noun)
a univalent chemical radical derived from ethylene	a univalent chemical radical derived from ethylene
shiny and tough and flexible plastic; used especially for floor coverings