Vipera berus vs common viper

Vipera berus and common viper both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vipera berus	Yes	No	No	No
common viper	Yes	No	No	No

As nouns, Vipera berus and common viper are synonyms defined as:

Vipera berus and common viper: small terrestrial viper common in northern Eurasia

Other synonyms of Vipera berus include adder.

Vipera berus (noun)	common viper (noun)
small terrestrial viper common in northern Eurasia	small terrestrial viper common in northern Eurasia