cytophotometry vs photometry

cytophotometry and photometry both are nouns.

Word	Noun	Adjective	Verb	Adverb
cytophotometry	Yes	No	No	No
photometry	Yes	No	No	No

As nouns, photometry is a hypernym of cytophotometry; that is, photometry is a word with a broader meaning than cytophotometry:

cytophotometry: the study of chemical compounds inside a cell by means of a cytophotometer
photometry: measurement of the properties of light (especially luminous intensity)

cytophotometry (noun)	photometry (noun)
the study of chemical compounds inside a cell by means of a cytophotometer	measurement of the properties of light (especially luminous intensity)