pepper grass vs pepperwort

pepper grass and pepperwort both are nouns.

Word	Noun	Adjective	Verb	Adverb
pepper grass	Yes	No	No	No
pepperwort	Yes	No	No	No

As nouns, pepper grass and pepperwort are synonyms defined as:

pepper grass and pepperwort: annual herb used as salad green and garnish

Other synonyms of pepper grass include common garden cress, garden pepper cress, Lepidium sativum.

pepper grass (noun)	pepperwort (noun)
annual herb used as salad green and garnish	annual herb used as salad green and garnish
	any of several water ferns of the genus Marsilea having four leaflets