methylene radical vs methylene

methylene radical and methylene both are nouns.

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

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

methylene radical and methylene: the bivalent radical CH2 derived from methane

Other synonyms of methylene radical include methylene group.

methylene radical (noun)	methylene (noun)
the bivalent radical CH2 derived from methane	the bivalent radical CH2 derived from methane