clumsy person vs lubber

clumsy person and lubber both are nouns.

Word	Noun	Adjective	Verb	Adverb
clumsy person	Yes	No	No	No
lubber	Yes	No	No	No

As nouns, lubber is a hyponym of clumsy person; that is, lubber is a word with a more specific, narrower meaning than clumsy person:

Other hyponyms of clumsy person include butterfingers, duffer, clod, gawk, goon, lout, lummox, lump, oaf, stumblebum.

clumsy person (noun)	lubber (noun)
a person with poor motor coordination	an awkward stupid person
	an inexperienced sailor; a sailor on the first voyage