Iris pseudacorus vs yellow flag

Iris pseudacorus and yellow flag both are nouns.

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

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

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

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

Iris pseudacorus (noun)	yellow flag (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