bathymeter vs measuring system

bathymeter and measuring system both are nouns.

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

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

bathymeter: an instrument that measures the depth of water
measuring system: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of bathymeter include measuring device, measuring instrument.

bathymeter (noun)	measuring system (noun)
an instrument that measures the depth of water	instrument that shows the extent or amount or quantity or degree of something