Rhus trilobata vs shumac

Rhus trilobata and shumac both are nouns.

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

As nouns, shumac is a hypernym of Rhus trilobata; that is, shumac 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
shumac: a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)

Other hypernyms of Rhus trilobata include sumac, sumach.

Rhus trilobata (noun)	shumac (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)