viper's grass vs Scorzonera hispanica

viper's grass and Scorzonera hispanica both are nouns.

Word	Noun	Adjective	Verb	Adverb
viper's grass	Yes	No	No	No
Scorzonera hispanica	Yes	No	No	No

As nouns, viper's grass and Scorzonera hispanica are synonyms defined as:

viper's grass and Scorzonera hispanica: perennial south European herb having narrow entire leaves and solitary yellow flower heads and long black edible roots shaped like carrots

Other synonyms of viper's grass include black salsify, scorzonera.

viper's grass (noun)	Scorzonera hispanica (noun)
perennial south European herb having narrow entire leaves and solitary yellow flower heads and long black edible roots shaped like carrots	perennial south European herb having narrow entire leaves and solitary yellow flower heads and long black edible roots shaped like carrots