poison sumac vs poison ash

poison sumac and poison ash both are nouns.

Word	Noun	Adjective	Verb	Adverb
poison sumac	Yes	No	No	No
poison ash	Yes	No	No	No

As nouns, poison sumac and poison ash are synonyms defined as:

poison sumac and poison ash: smooth American swamp shrub with pinnate leaves and greenish flowers followed by greenish white berries; yields an irritating oil

Other synonyms of poison sumac include poison dogwood, Rhus vernix, Toxicodendron vernix.

poison sumac (noun)	poison ash (noun)
smooth American swamp shrub with pinnate leaves and greenish flowers followed by greenish white berries; yields an irritating oil	smooth American swamp shrub with pinnate leaves and greenish flowers followed by greenish white berries; yields an irritating oil
dermatitis resulting from contact with a poison sumac plant