alkyl group vs alkyl

alkyl group and alkyl both are nouns.

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

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

alkyl group and alkyl: any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons

Other synonyms of alkyl group include alkyl radical.

alkyl group (noun)	alkyl (noun)
any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons	any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons