heliometer vs measuring system

heliometer and measuring system both are nouns.

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

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

heliometer: an instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope
measuring system: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of heliometer include measuring device, measuring instrument.

heliometer (noun)	measuring system (noun)
an instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope	instrument that shows the extent or amount or quantity or degree of something