lubber's point vs lubber line

lubber's point and lubber line both are nouns.

Word	Noun	Adjective	Verb	Adverb
lubber's point	Yes	No	No	No
lubber line	Yes	No	No	No

As nouns, lubber's point and lubber line are synonyms defined as:

lubber's point and lubber line: a fixed line on a ship's compass indicating its heading

Other synonyms of lubber's point include lubber's line, lubber's mark.

lubber's point (noun)	lubber line (noun)
a fixed line on a ship's compass indicating its heading	a fixed line on a ship's compass indicating its heading