summer sweet vs shrub

summer sweet and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
summer sweet	Yes	No	No	No
shrub	Yes	No	No	No

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

summer sweet: shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of summer sweet include bush.

summer sweet (noun)	shrub (noun)
shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers	a low woody perennial plant usually having several major stems