death instinct vs impulse

death instinct and impulse both are nouns.

Word	Noun	Adjective	Verb	Adverb
death instinct	Yes	No	No	No
impulse	Yes	No	No	No

As nouns, impulse is a hypernym of death instinct; that is, impulse is a word with a broader meaning than death instinct:

Other hypernyms of death instinct include urge.

death instinct (noun)	impulse (noun)
(psychoanalysis) an unconscious urge to die	the act of applying force suddenly
	an impelling force or strength
	the electrical discharge that travels along a nerve fiber
	(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)
	a sudden desire
	an instinctive motive