sonar vs measuring instrument

sonar and measuring instrument both are nouns.

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

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

sonar: a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
measuring instrument: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of sonar include measuring device, measuring system, navigational instrument.

sonar (noun)	measuring instrument (noun)
a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return	instrument that shows the extent or amount or quantity or degree of something