densitometry vs measurement

densitometry and measurement both are nouns.

Word	Noun	Adjective	Verb	Adverb
densitometry	Yes	No	No	No
measurement	Yes	No	No	No

As nouns, measurement is a hypernym of densitometry; that is, measurement is a word with a broader meaning than densitometry:

densitometry: measuring the optical density of a substance by shining light on it and measuring its transmission
measurement: the act or process of assigning numbers to phenomena according to a rule

Other hypernyms of densitometry include measure, measuring, mensuration.

densitometry (noun)	measurement (noun)
measuring the optical density of a substance by shining light on it and measuring its transmission	the act or process of assigning numbers to phenomena according to a rule