intimacy vs liaison

intimacy and liaison both are nouns.

Word	Noun	Adjective	Verb	Adverb
intimacy	Yes	No	No	No
liaison	Yes	No	No	No

As nouns, intimacy and liaison are synonyms defined as:

intimacy and liaison: a usually secretive or illicit sexual relationship

Other synonyms of intimacy include affair, affaire, amour, involvement.

intimacy (noun)	liaison (noun)
close or warm friendship	a channel for communication between groups
a feeling of being intimate and belonging together	a usually secretive or illicit sexual relationship
a usually secretive or illicit sexual relationship