Rhus trilobata vs sumac

Rhus trilobata and sumac both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rhus trilobata	Yes	No	No	No
sumac	Yes	No	No	No

As nouns, sumac is a hypernym of Rhus trilobata; that is, sumac is a word with a broader meaning than Rhus trilobata:

Rhus trilobata: deciduous shrub of California with unpleasantly scented usually trifoliate leaves and edible fruit
sumac: a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)

Other hypernyms of Rhus trilobata include shumac, sumach.

Rhus trilobata (noun)	sumac (noun)
deciduous shrub of California with unpleasantly scented usually trifoliate leaves and edible fruit	a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)
	wood of a sumac