stinking iris vs roast beef plant

stinking iris and roast beef plant both are nouns.

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

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

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

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

stinking iris (noun)	roast beef plant (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