scorzonera vs viper's grass

scorzonera and viper's grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
scorzonera	Yes	No	No	No
viper's grass	Yes	No	No	No

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

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

Other synonyms of scorzonera include black salsify, Scorzonera hispanica.

scorzonera (noun)	viper's grass (noun)
long black salsify	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