cacodyl group vs arsenic group

cacodyl group and arsenic group both are nouns.

Word	Noun	Adjective	Verb	Adverb
cacodyl group	Yes	No	No	No
arsenic group	Yes	No	No	No

As nouns, cacodyl group and arsenic group are synonyms defined as:

cacodyl group and arsenic group: the univalent group derived from arsine

Other synonyms of cacodyl group include cacodyl, cacodyl radical.

cacodyl group (noun)	arsenic group (noun)
the univalent group derived from arsine	the univalent group derived from arsine