dekametre vs decametre

dekametre and decametre both are nouns.

Word	Noun	Adjective	Verb	Adverb
dekametre	Yes	No	No	No
decametre	Yes	No	No	No

As nouns, dekametre and decametre are synonyms defined as:

Other synonyms of dekametre include dam, decameter, dekameter, dkm.

dekametre (noun)	decametre (noun)
a metric unit of length equal to ten meters	a metric unit of length equal to ten meters