is a specific kind of: amount, measure, quantity.

is a broader term that covers: 24-hour interval, day, mean solar day, solar day, twenty-four hour period, twenty-four hours | night | mean solar time, mean time | ephemeris time, TDT, terrestrial dynamical time, terrestrial time, TT | month | day, sidereal day | bell, ship's bell | 60 minutes, hour, hr | 30 minutes, half-hour | 15 minutes, quarter-hour | min, minute | quarter | s, sec, second | attosecond | femtosecond | picosecond | nanosecond | microsecond | millisecond, msec ... show more.