liaison vs inter-group communication

liaison and inter-group communication both are nouns.

Word	Noun	Adjective	Verb	Adverb
liaison	Yes	No	No	No
inter-group communication	Yes	No	No	No

As nouns, liaison and inter-group communication are synonyms defined as:

liaison and inter-group communication: a channel for communication between groups

Other synonyms of liaison include contact, link.

liaison (noun)	inter-group communication (noun)
a channel for communication between groups	a channel for communication between groups
a usually secretive or illicit sexual relationship