azimuth mark vs reference point

azimuth mark and reference point both are nouns.

Word	Noun	Adjective	Verb	Adverb
azimuth mark	Yes	No	No	No
reference point	Yes	No	No	No

As nouns, reference point is a hypernym of azimuth mark; that is, reference point is a word with a broader meaning than azimuth mark:

azimuth mark: The marked point, on an azimuth marker, for which the azimuth(s) to one or more distant points is (are) given.
reference point: an indicator that orients you generally

Other hypernyms of azimuth mark include point of reference, reference.

azimuth mark (noun)	reference point (noun)
The marked point, on an azimuth marker, for which the azimuth(s) to one or more distant points is (are) given.	an indicator that orients you generally