Agkistrodon contortrix vs copperhead

Agkistrodon contortrix and copperhead both are nouns.

Word	Noun	Adjective	Verb	Adverb
Agkistrodon contortrix	Yes	No	No	No
copperhead	Yes	No	No	No

As nouns, Agkistrodon contortrix and copperhead are synonyms defined as:

Agkistrodon contortrix and copperhead: common coppery brown pit viper of upland eastern United States

Agkistrodon contortrix (noun)	copperhead (noun)
common coppery brown pit viper of upland eastern United States	common coppery brown pit viper of upland eastern United States
	venomous but sluggish reddish-brown snake of Australia