mileometer vs milometer

mileometer and milometer both are nouns.

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

As nouns, mileometer and milometer are synonyms defined as:

Other synonyms of mileometer include hodometer, odometer.

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