lubber line vs reference point

lubber line and reference point both are nouns.

Word	Noun	Adjective	Verb	Adverb
lubber line	Yes	No	No	No
reference point	Yes	No	No	No

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

Other hypernyms of lubber line include point of reference, reference.

lubber line (noun)	reference point (noun)
a fixed line on a ship's compass indicating its heading	an indicator that orients you generally