Open English Wordnet
Nouns
(n)pacesetter, pacemakera leading instance in its field“the new policy will be a pacesetter in community relations”
(n)pacemaker, cardiac pacemaker, sinoatrial node, SA nodea specialized bit of heart tissue that controls the heartbeat
(n)pacemaker, artificial pacemakeran implanted electronic device that takes over the function of the natural cardiac pacemaker