is a specific kind of: unit, unit of measurement.

is a broader term that covers: erg | electron volt, eV | J, joule, watt second | calorie, gram calorie, small calorie | Calorie, kilocalorie, kilogram calorie, large calorie, nutritionist's calorie | B.Th.U., British thermal unit, BTU | therm | watt-hour | B.T.U., Board of Trade unit, kilowatt hour, kW-hr | foot-pound | foot-ton | foot-poundal | horsepower-hour | kilogram-meter ... show more.