lubber vs landlubber

lubber and landlubber both are nouns.

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

As nouns, lubber and landlubber are synonyms defined as:

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

Other synonyms of lubber include landsman.

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