impulse vs impetus

impulse and impetus both are nouns.

Word	Noun	Adjective	Verb	Adverb
impulse	Yes	No	No	No
impetus	Yes	No	No	No

As nouns, impulse and impetus are synonyms defined as:

Other synonyms of impulse include impulsion.

impulse (noun)	impetus (noun)
the act of applying force suddenly	the act of applying force suddenly
an impelling force or strength	a force that moves something along
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