Nouns

(n)urge, impulsean instinctive motive“profound religious impulses”
(n)caprice, impulse, whima sudden desire“he bought it on an impulse”
(n)nerve impulse, nervous impulse, neural impulse, impulsethe electrical discharge that travels along a nerve fiber“they demonstrated the transmission of impulses from the cortex to the hypothalamus”
(n)pulsation, pulsing, pulse, impulse(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)“the pulsations seemed to be coming from a star”
(n)impulse, impulsion, impetusthe act of applying force suddenly“the impulse knocked him over”
(n)momentum, impulsean impelling force or strength“the car's momentum carried it off the road”