impropriety vs liberty

impropriety and liberty both are nouns.

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

As nouns, impropriety and liberty are synonyms defined as:

Other synonyms of impropriety include familiarity, indecorum.

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