American spelling vs tonne-kilometer

American spelling and tonne-kilometer both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
tonne-kilometer	Yes	No	No	No

American spelling (noun)	tonne-kilometer (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	a unit of measure used in freight transport which determines the transport of one tonne of goods by a transport mode over one kilometer.