octant vs measuring system

octant and measuring system both are nouns.

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

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

octant: a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration
measuring system: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of octant include measuring device, measuring instrument.

octant (noun)	measuring system (noun)
a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration	instrument that shows the extent or amount or quantity or degree of something