marsh cress vs yellow watercress

marsh cress and yellow watercress both are nouns.

Word	Noun	Adjective	Verb	Adverb
marsh cress	Yes	No	No	No
yellow watercress	Yes	No	No	No

As nouns, marsh cress and yellow watercress are synonyms defined as:

marsh cress and yellow watercress: annual or biennial cress growing in damp places sometimes used in salads or as a potherb; troublesome weed in some localities

Other synonyms of marsh cress include Rorippa islandica.

marsh cress (noun)	yellow watercress (noun)
annual or biennial cress growing in damp places sometimes used in salads or as a potherb; troublesome weed in some localities	annual or biennial cress growing in damp places sometimes used in salads or as a potherb; troublesome weed in some localities