Heartbeat
Part of speech: noun
Definition: One pulsation of the heart; especially an irregular one, hence the emotion which causes it. The rhythm at which a heart pulsates, a cardiac indicator A driving impulse or vital force. A very short space of time; an instant. A periodic signal generated by hardware or software to indicate normal operation or to synchronize other parts of a system.
Example sentence: If God had me run for something, I would do it in a heartbeat.
Pulse
Part of speech: noun
Definition: Any annual legume yielding from 1 to 12 grains or seeds of variable size, shape and colour within a pod, and used as food for humans or animals.A normally regular beat felt when arteries are depressed, caused by the pumping action of the heart.A beat or throb.The beat or tactus of a piece of music.
Example sentence: Aaron Spelling always had his finger on the pulse of pop culture, he knew what the public wanted to see. He was one of the most loyal men in this business and believed in me at a time in my career when no one else would.