speed indicator vs speedometer

speed indicator and speedometer both are nouns.

Word	Noun	Adjective	Verb	Adverb
speed indicator	Yes	No	No	No
speedometer	Yes	No	No	No

As nouns, speed indicator and speedometer are synonyms defined as:

speed indicator and speedometer: a meter fixed to a vehicle that measures and displays its speed

speed indicator (noun)	speedometer (noun)
a meter fixed to a vehicle that measures and displays its speed	a meter fixed to a vehicle that measures and displays its speed