tonne-kilometer vs tkm

tonne-kilometer and tkm both are nouns.

Word	Noun	Adjective	Verb	Adverb
tonne-kilometer	Yes	No	No	No
tkm	Yes	No	No	No

As nouns, tonne-kilometer and tkm are synonyms defined as:

tonne-kilometer and 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.

Other synonyms of tonne-kilometer include tonne-kilometre.

tonne-kilometer (noun)	tkm (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.	a unit of measure used in freight transport which determines the transport of one tonne of goods by a transport mode over one kilometer.