landlubber vs lubber

landlubber and lubber both are nouns.

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

As nouns, landlubber and lubber are synonyms defined as:

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

Other synonyms of landlubber include landsman.

landlubber (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