yellow horned poppy vs horn poppy

yellow horned poppy and horn poppy both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow horned poppy	Yes	No	No	No
horn poppy	Yes	No	No	No

As nouns, yellow horned poppy and horn poppy are synonyms defined as:

yellow horned poppy and horn poppy: yellow-flowered Eurasian glaucous herb naturalized in along sandy shores in eastern North America

Other synonyms of yellow horned poppy include Glaucium flavum, horned poppy, sea poppy.

yellow horned poppy (noun)	horn poppy (noun)
yellow-flowered Eurasian glaucous herb naturalized in along sandy shores in eastern North America	yellow-flowered Eurasian glaucous herb naturalized in along sandy shores in eastern North America