tach vs measuring instrument

tach and measuring instrument both are nouns.

Word	Noun	Adjective	Verb	Adverb
tach	Yes	No	No	No
measuring instrument	Yes	No	No	No

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

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

Other hypernyms of tach include measuring device, measuring system.

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