scarlet sumac vs shumac

scarlet sumac and shumac both are nouns.

Word	Noun	Adjective	Verb	Adverb
scarlet sumac	Yes	No	No	No
shumac	Yes	No	No	No

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

scarlet sumac: common nonpoisonous shrub of eastern North America with waxy compound leaves and green paniculate flowers followed by red berries
shumac: a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)

Other hypernyms of scarlet sumac include sumac, sumach.

scarlet sumac (noun)	shumac (noun)
common nonpoisonous shrub of eastern North America with waxy compound leaves and green paniculate flowers followed by red berries	a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)