gm vs metric weight unit

gm and metric weight unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
gm	Yes	No	No	No
metric weight unit	Yes	No	No	No

As nouns, metric weight unit is a hypernym of gm; that is, metric weight unit is a word with a broader meaning than gm:

Other hypernyms of gm include weight unit.

gm (noun)	metric weight unit (noun)
a metric unit of weight equal to one thousandth of a kilogram	a decimal unit of weight based on the gram