- timekeeper, timer - (sports) an official who keeps track of the time elapsed
--1 is a kind of official
- timekeeper - a clerk who keeps track of the hours worked by employees
--2 is a kind of clerk
- timepiece, timekeeper - a measuring instrument or device for keeping time
--3 is a kind of measuring instrument, measuring system, measuring device
--3 has parts:
--3 has particulars:balance wheel, balance; dial; escapement; hairspring; hand; time-ball atomic clock; clock; sandglass; sundial; timer; watch, ticker - timepiece, timekeeper - a measuring instrument or device for keeping time