western poison oak vs Rhus diversiloba

western poison oak and Rhus diversiloba both are nouns.

Word	Noun	Adjective	Verb	Adverb
western poison oak	Yes	No	No	No
Rhus diversiloba	Yes	No	No	No

As nouns, western poison oak and Rhus diversiloba are synonyms defined as:

western poison oak and Rhus diversiloba: poisonous shrub of the Pacific coast of North America that causes a rash on contact

Other synonyms of western poison oak include Toxicodendron diversilobum.

western poison oak (noun)	Rhus diversiloba (noun)
poisonous shrub of the Pacific coast of North America that causes a rash on contact	poisonous shrub of the Pacific coast of North America that causes a rash on contact