photometer vs exposure meter

photometer and exposure meter both are nouns.

Word	Noun	Adjective	Verb	Adverb
photometer	Yes	No	No	No
exposure meter	Yes	No	No	No

As nouns, photometer and exposure meter are synonyms defined as:

photometer and exposure meter: photographic equipment that measures the intensity of light

Other synonyms of photometer include light meter.

photometer (noun)	exposure meter (noun)
photographic equipment that measures the intensity of light	photographic equipment that measures the intensity of light
measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source