semaphore plant vs shrub

semaphore plant and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
semaphore plant	Yes	No	No	No
shrub	Yes	No	No	No

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

semaphore plant: erect tropical Asian shrub whose small lateral leaflets rotate on their axes and jerk up and down under the influence of sunshine
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of semaphore plant include bush.

semaphore plant (noun)	shrub (noun)
erect tropical Asian shrub whose small lateral leaflets rotate on their axes and jerk up and down under the influence of sunshine	a low woody perennial plant usually having several major stems