impulse vs death wish

impulse and death wish both are nouns.

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

As nouns, death wish is a hyponym of impulse; that is, death wish is a word with a more specific, narrower meaning than impulse:

Other hyponyms of impulse include abience, adience, death instinct, Thanatos, itchy feet, wanderlust.

impulse (noun)	death wish (noun)
the act of applying force suddenly	(psychoanalysis) an unconscious urge to die
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