poison ash vs poison sumac

poison ash and poison sumac both are nouns.

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

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

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

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

poison ash (noun)	poison sumac (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