cress plant vs cress

cress plant and cress both are nouns.

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

As nouns, cress plant and cress are synonyms defined as:

cress plant and cress: any of various plants of the family Cruciferae with edible leaves that have a pungent taste

cress plant (noun)	cress (noun)
any of various plants of the family Cruciferae with edible leaves that have a pungent taste	pungent leaves of any of numerous cruciferous herbs
	any of various plants of the family Cruciferae with edible leaves that have a pungent taste