Adam's apple vs shrub

Adam's apple and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Adam's apple	Yes	No	No	No
shrub	Yes	No	No	No

As nouns, shrub is a hypernym of Adam's apple; that is, shrub is a word with a broader meaning than Adam's apple:

Adam's apple: tropical shrub having glossy foliage and fragrant nocturnal flowers with crimped or wavy corollas; northern India to Thailand
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Adam's apple include bush.

Adam's apple (noun)	shrub (noun)
the largest cartilage of the larynx	a low woody perennial plant usually having several major stems
tropical shrub having glossy foliage and fragrant nocturnal flowers with crimped or wavy corollas; northern India to Thailand