thermometer vs measuring device

thermometer and measuring device both are nouns.

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

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

thermometer: measuring instrument for measuring temperature
measuring device: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of thermometer include measuring instrument, measuring system.

thermometer (noun)	measuring device (noun)
measuring instrument for measuring temperature	instrument that shows the extent or amount or quantity or degree of something