liberty vs impropriety

liberty and impropriety both are nouns.

Word	Noun	Adjective	Verb	Adverb
liberty	Yes	No	No	No
impropriety	Yes	No	No	No

As nouns, liberty and impropriety are synonyms defined as:

Other synonyms of liberty include familiarity, indecorum.

liberty (noun)	impropriety (noun)
an act of undue intimacy	an act of undue intimacy
immunity from arbitrary exercise of authority: political independence	an indecent or improper act
freedom of choice	an improper demeanor
personal freedom from servitude or confinement or oppression	the condition of being improper
leave granted to a sailor or naval officer