copperhead vs Agkistrodon contortrix

copperhead and Agkistrodon contortrix both are nouns.

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

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

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

copperhead (noun)	Agkistrodon contortrix (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