pepperwort vs cress

pepperwort and cress both are nouns.

Word	Noun	Adjective	Verb	Adverb
pepperwort	Yes	No	No	No
cress	Yes	No	No	No

As nouns, cress is a hypernym of pepperwort; that is, cress is a word with a broader meaning than pepperwort:

pepperwort: annual herb used as salad green and garnish
cress: any of various plants of the family Cruciferae with edible leaves that have a pungent taste

Other hypernyms of pepperwort include cress plant.

pepperwort (noun)	cress (noun)
annual herb used as salad green and garnish	pungent leaves of any of numerous cruciferous herbs
any of several water ferns of the genus Marsilea having four leaflets	any of various plants of the family Cruciferae with edible leaves that have a pungent taste