variometer vs measuring device

variometer and measuring device both are nouns.

Word	Noun	Adjective	Verb	Adverb
variometer	Yes	No	No	No
measuring device	Yes	No	No	No

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

variometer: a measuring instrument for measuring variations in a magnetic field
measuring device: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of variometer include measuring instrument, measuring system.

variometer (noun)	measuring device (noun)
a measuring instrument for measuring variations in a magnetic field	instrument that shows the extent or amount or quantity or degree of something