gladdon iris vs stinking iris

gladdon iris and stinking iris both are nouns.

Word	Noun	Adjective	Verb	Adverb
gladdon iris	Yes	No	No	No
stinking iris	Yes	No	No	No

As nouns, gladdon iris and stinking iris are synonyms defined as:

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

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

gladdon iris (noun)	stinking 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