milometer vs mileometer

milometer and mileometer both are nouns.

Word	Noun	Adjective	Verb	Adverb
milometer	Yes	No	No	No
mileometer	Yes	No	No	No

As nouns, milometer and mileometer are synonyms defined as:

Other synonyms of milometer include hodometer, odometer.

milometer (noun)	mileometer (noun)
a meter that shows mileage traversed	a meter that shows mileage traversed