cacodyl radical vs cacodyl

cacodyl radical and cacodyl both are nouns.

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

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

Other synonyms of cacodyl radical include arsenic group, cacodyl group.

cacodyl radical (noun)	cacodyl (noun)
the univalent group derived from arsine	the univalent group derived from arsine
	a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air