sumac vs shrub

sumac and shrub both are nouns.

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

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

sumac: a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of sumac include bush.

sumac (noun)	shrub (noun)
a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)	a low woody perennial plant usually having several major stems
wood of a sumac