alkyl radical vs alkyl group

alkyl radical and alkyl group both are nouns.

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

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

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

Other synonyms of alkyl radical include alkyl.

alkyl radical (noun)	alkyl group (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