is a specific kind of: metric, metric unit | mass unit.

is a broader term that covers: mcg, microgram | mg, milligram | nanogram, ng | grain, metric grain | decigram, dg | carat | g, gm, gram, gramme | gram-atomic weight, gram atom | gram molecule, mol, mole | dag, decagram, dekagram, dkg | hectogram, hg | kg, kilo, kilogram | myg, myriagram | centner | centner, doppelzentner, hundredweight, metric hundredweight | quintal | metric ton, MT, t, tonne ... show more.

is a part of: metric system.