crepe myrtle vs shrub

crepe myrtle and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
crepe myrtle	Yes	No	No	No
shrub	Yes	No	No	No

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

crepe myrtle: ornamental shrub from eastern India commonly planted in the southern United States
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of crepe myrtle include bush.

crepe myrtle (noun)	shrub (noun)
ornamental shrub from eastern India commonly planted in the southern United States	a low woody perennial plant usually having several major stems