Nouns

(n)startle, jump, starta sudden involuntary movement“he awoke with a start”

Verbs

(v)startle, galvanize, galvaniseto stimulate to action“the loud noise startled him awake”, “galvanized into action”
(v)startle, jump, startmove or jump suddenly, as if in surprise or alarm“She startled when I walked into the room”