cresson vs watercress

cresson is not a noun while watercress is a noun.

Word	Noun	Adjective	Verb	Adverb
cresson	No	Yes	No	No
watercress	Yes	Yes	No	No

As adjectives, cresson and watercress are synonyms defined as:

cresson and watercress: of a moderate yellow-green color that is greener and deeper than moss green and yellower and darker than pea green

Other synonyms of cresson include cress green.

cresson (noun)	watercress (noun)
	cresses that grow in clear ponds and streams
	any of several water-loving cresses

cresson (adjective)	watercress (adjective)
of a moderate yellow-green color that is greener and deeper than moss green and yellower and darker than pea green	of a moderate yellow-green color that is greener and deeper than moss green and yellower and darker than pea green