bathymetry vs measurement

bathymetry and measurement both are nouns.

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

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

bathymetry: measuring the depths of the oceans
measurement: the act or process of assigning numbers to phenomena according to a rule

Other hypernyms of bathymetry include measure, measuring, mensuration.

bathymetry (noun)	measurement (noun)
measuring the depths of the oceans	the act or process of assigning numbers to phenomena according to a rule