radar vs measuring device

radar and measuring device both are nouns.

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

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

radar: measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
measuring device: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of radar include measuring instrument, measuring system.

radar (noun)	measuring device (noun)
measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects	instrument that shows the extent or amount or quantity or degree of something