copperhead vs Denisonia superba

copperhead and Denisonia superba both are nouns.

Word	Noun	Adjective	Verb	Adverb
copperhead	Yes	No	No	No
Denisonia superba	Yes	No	No	No

As nouns, copperhead and Denisonia superba are synonyms defined as:

copperhead and Denisonia superba: venomous but sluggish reddish-brown snake of Australia

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