shore leave vs liberty

shore leave and liberty both are nouns.

Word	Noun	Adjective	Verb	Adverb
shore leave	Yes	No	No	No
liberty	Yes	No	No	No

As nouns, shore leave and liberty are synonyms defined as:

shore leave (noun)	liberty (noun)
leave granted to a sailor or naval officer	an act of undue intimacy
	immunity from arbitrary exercise of authority: political independence
	freedom of choice
	personal freedom from servitude or confinement or oppression
	leave granted to a sailor or naval officer