roast beef plant vs gladdon iris

roast beef plant and gladdon iris both are nouns.

Word	Noun	Adjective	Verb	Adverb
roast beef plant	Yes	No	No	No
gladdon iris	Yes	No	No	No

As nouns, roast beef plant and gladdon iris are synonyms defined as:

roast beef plant and gladdon iris: iris with purple flowers and foul-smelling leaves; southern and western Europe and North Africa

Other synonyms of roast beef plant include gladdon, Iris foetidissima, stinking gladwyn, stinking iris.

roast beef plant (noun)	gladdon iris (noun)
iris with purple flowers and foul-smelling leaves; southern and western Europe and North Africa	iris with purple flowers and foul-smelling leaves; southern and western Europe and North Africa