flow meter vs measuring system

flow meter and measuring system both are nouns.

Word	Noun	Adjective	Verb	Adverb
flow meter	Yes	No	No	No
measuring system	Yes	No	No	No

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

flow meter: a device used to measure mass or volumetric flow rate of a liquid or gas.
measuring system: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of flow meter include device, measuring device, measuring instrument.

flow meter (noun)	measuring system (noun)
a device used to measure mass or volumetric flow rate of a liquid or gas.	instrument that shows the extent or amount or quantity or degree of something