stinking iris vs gladdon iris

stinking iris and gladdon iris both are nouns.

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

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

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

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

stinking iris (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