viper's grass vs scorzonera

viper's grass and scorzonera both are nouns.

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

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

viper's grass and scorzonera: 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 hispanica.

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