yellow water flag vs Iris pseudacorus

yellow water flag and Iris pseudacorus both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow water flag	Yes	No	No	No
Iris pseudacorus	Yes	No	No	No

As nouns, yellow water flag and Iris pseudacorus are synonyms defined as:

yellow water flag and Iris pseudacorus: common yellow-flowered iris of Europe and North Africa, naturalized in United States and often cultivated

Other synonyms of yellow water flag include yellow flag, yellow iris.

yellow water flag (noun)	Iris pseudacorus (noun)
common yellow-flowered iris of Europe and North Africa, naturalized in United States and often cultivated	common yellow-flowered iris of Europe and North Africa, naturalized in United States and often cultivated