sonometer vs measuring system

sonometer and measuring system both are nouns.

Word	Noun	Adjective	Verb	Adverb
sonometer	Yes	No	No	No
measuring system	Yes	No	No	No

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

sonometer: an instrument used to measure the sensitivity of hearing
measuring system: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of sonometer include measuring device, measuring instrument.

sonometer (noun)	measuring system (noun)
an instrument used to measure the sensitivity of hearing	instrument that shows the extent or amount or quantity or degree of something