poison ash vs poison dogwood

poison ash and poison dogwood both are nouns.

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

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

poison ash and poison dogwood: 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 sumac, Rhus vernix, Toxicodendron vernix.

poison ash (noun)	poison dogwood (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