impulse vs caprice

impulse and caprice both are nouns.

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

As nouns, impulse and caprice are synonyms defined as:

Other synonyms of impulse include whim.

impulse (noun)	caprice (noun)
the act of applying force suddenly	a sudden desire
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