karat vs unit of measurement

karat and unit of measurement both are nouns.

Word	Noun	Adjective	Verb	Adverb
karat	Yes	No	No	No
unit of measurement	Yes	No	No	No

As nouns, unit of measurement is a hypernym of karat; that is, unit of measurement is a word with a broader meaning than karat:

karat: the unit of measurement for the proportion of gold in an alloy; 18-karat gold is 75% gold; 24-karat gold is pure gold
unit of measurement: any division of quantity accepted as a standard of measurement or exchange

Other hypernyms of karat include unit.

karat (noun)	unit of measurement (noun)
the unit of measurement for the proportion of gold in an alloy; 18-karat gold is 75% gold; 24-karat gold is pure gold	any division of quantity accepted as a standard of measurement or exchange