hydroxyl radical vs hydroxyl

hydroxyl radical and hydroxyl both are nouns.

Word	Noun	Adjective	Verb	Adverb
hydroxyl radical	Yes	No	No	No
hydroxyl	Yes	No	No	No

As nouns, hydroxyl radical and hydroxyl are synonyms defined as:

hydroxyl radical and hydroxyl: the monovalent group -OH in such compounds as bases and some acids and alcohols

Other synonyms of hydroxyl radical include hydroxyl group.

hydroxyl radical (noun)	hydroxyl (noun)
the monovalent group -OH in such compounds as bases and some acids and alcohols	the monovalent group -OH in such compounds as bases and some acids and alcohols