hygrometer vs measuring device

hygrometer and measuring device both are nouns.

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

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

hygrometer: measuring instrument for measuring the relative humidity of the atmosphere
measuring device: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of hygrometer include measuring instrument, measuring system.

hygrometer (noun)	measuring device (noun)
measuring instrument for measuring the relative humidity of the atmosphere	instrument that shows the extent or amount or quantity or degree of something