tkm vs tonne-kilometre

tkm and tonne-kilometre both are nouns.

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

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

tkm and tonne-kilometre: 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 tkm include tonne-kilometer.

tkm (noun)	tonne-kilometre (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.