spherometer vs measuring device

spherometer and measuring device both are nouns.

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

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

spherometer: a measuring instrument for measuring the curvature of a surface
measuring device: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of spherometer include measuring instrument, measuring system.

spherometer (noun)	measuring device (noun)
a measuring instrument for measuring the curvature of a surface	instrument that shows the extent or amount or quantity or degree of something