affaire vs involvement

affaire and involvement both are nouns.

Word	Noun	Adjective	Verb	Adverb
affaire	Yes	No	No	No
involvement	Yes	No	No	No

As nouns, affaire and involvement are synonyms defined as:

affaire and involvement: a usually secretive or illicit sexual relationship

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

affaire (noun)	involvement (noun)
a usually secretive or illicit sexual relationship	the act of sharing in the activities of a group
	a sense of concern with and curiosity about someone or something
	a connection of inclusion or containment
	a usually secretive or illicit sexual relationship
	the condition of sharing in common with others (as fellows or partners etc.)