mesquite vs shrub

mesquite and shrub both are nouns.

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

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

mesquite: any of several small spiny trees or shrubs of the genus Prosopis having small flowers in axillary cylindrical spikes followed by large pods rich in sugar
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of mesquite include bush.

mesquite (noun)	shrub (noun)
any of several small spiny trees or shrubs of the genus Prosopis having small flowers in axillary cylindrical spikes followed by large pods rich in sugar	a low woody perennial plant usually having several major stems