tkm vs unit of measurement

tkm and unit of measurement both are nouns.

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

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

tkm: a unit of measure used in freight transport which determines the transport of one tonne of goods by a transport mode over one kilometer.
unit of measurement: any division of quantity accepted as a standard of measurement or exchange

Other hypernyms of tkm include unit.

tkm (noun)	unit of measurement (noun)
a unit of measure used in freight transport which determines the transport of one tonne of goods by a transport mode over one kilometer.	any division of quantity accepted as a standard of measurement or exchange