spasm vs bronchospasm

spasm and bronchospasm both are nouns.

Word	Noun	Adjective	Verb	Adverb
spasm	Yes	No	No	No
bronchospasm	Yes	No	No	No

As nouns, bronchospasm is a hyponym of spasm; that is, bronchospasm is a word with a more specific, narrower meaning than spasm:

spasm: (pathology) sudden constriction of a hollow organ (as a blood vessel)
bronchospasm: a spasm of the bronchi that makes exhalation difficult and noisy; associated with asthma and bronchitis

Other hyponyms of spasm include cardiospasm, heave, retch, laryngismus.

spasm (noun)	bronchospasm (noun)
(pathology) sudden constriction of a hollow organ (as a blood vessel)	a spasm of the bronchi that makes exhalation difficult and noisy; associated with asthma and bronchitis
a painful and involuntary muscular contraction