pepper grass vs Lepidium sativum

pepper grass and Lepidium sativum both are nouns.

Word	Noun	Adjective	Verb	Adverb
pepper grass	Yes	No	No	No
Lepidium sativum	Yes	No	No	No

As nouns, pepper grass and Lepidium sativum are synonyms defined as:

pepper grass and Lepidium sativum: annual herb used as salad green and garnish

Other synonyms of pepper grass include common garden cress, garden pepper cress, pepperwort.

pepper grass (noun)	Lepidium sativum (noun)
annual herb used as salad green and garnish	annual herb used as salad green and garnish