pepper grass vs common garden cress

pepper grass and common garden cress both are nouns.

Word	Noun	Adjective	Verb	Adverb
pepper grass	Yes	No	No	No
common garden cress	Yes	No	No	No

As nouns, pepper grass and common garden cress are synonyms defined as:

pepper grass and common garden cress: annual herb used as salad green and garnish

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

pepper grass (noun)	common garden cress (noun)
annual herb used as salad green and garnish	annual herb used as salad green and garnish