sugar sumac vs sumac

sugar sumac and sumac both are nouns.

Word	Noun	Adjective	Verb	Adverb
sugar sumac	Yes	No	No	No
sumac	Yes	No	No	No

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

sugar sumac: evergreen shrub of southeastern United States with spikes of reddish yellow flowers and glandular hairy fruits
sumac: a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)

Other hypernyms of sugar sumac include shumac, sumach.

sugar sumac (noun)	sumac (noun)
evergreen shrub of southeastern United States with spikes of reddish yellow flowers and glandular hairy fruits	a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)
	wood of a sumac