oximeter vs measuring device

oximeter and measuring device both are nouns.

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

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

oximeter: a measuring instrument that measures the oxygen in arterial blood
measuring device: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of oximeter include measuring instrument, measuring system.

oximeter (noun)	measuring device (noun)
a measuring instrument that measures the oxygen in arterial blood	instrument that shows the extent or amount or quantity or degree of something