speedometer vs speed indicator

speedometer and speed indicator both are nouns.

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

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

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

speedometer (noun)	speed indicator (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