landsman vs lubber

landsman and lubber both are nouns.

Word	Noun	Adjective	Verb	Adverb
landsman	Yes	No	No	No
lubber	Yes	No	No	No

As nouns, landsman and lubber are synonyms defined as:

landsman and lubber: an inexperienced sailor; a sailor on the first voyage

Other synonyms of landsman include landlubber.

landsman (noun)	lubber (noun)
an inexperienced sailor; a sailor on the first voyage	an awkward stupid person
a person who lives and works on land	an inexperienced sailor; a sailor on the first voyage