tachometer vs measuring device

tachometer and measuring device both are nouns.

Word	Noun	Adjective	Verb	Adverb
tachometer	Yes	No	No	No
measuring device	Yes	No	No	No

As nouns, measuring device is a hypernym of tachometer; that is, measuring device is a word with a broader meaning than tachometer:

tachometer: measuring instrument for indicating speed of rotation
measuring device: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of tachometer include measuring instrument, measuring system.

tachometer (noun)	measuring device (noun)
measuring instrument for indicating speed of rotation	instrument that shows the extent or amount or quantity or degree of something