A watch (timepiece).
A heart, especially a human one.
One who makes a tick mark.
A birdwatcher who aims to see (and tick off on a list) as many bird species as possible.
A ticker tape, either the traditional paper kind or a scrolling message on a screen.
A measuring or reporting device, particularly one which makes a ticking sound as the measured events occur.
A device that shows the time; a timepiece.
A person (or something controlled by a person) that is or isn't punctual.
A person who keeps records of the hours of attendance of employees.
A person who records the time elapsed in a sporting event.