common garden cress vs garden pepper cress

common garden cress and garden pepper cress both are nouns.

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

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

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

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

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