affaire vs amour

affaire and amour both are nouns.

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

As nouns, affaire and amour are synonyms defined as:

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

affaire (noun)	amour (noun)
a usually secretive or illicit sexual relationship	a usually secretive or illicit sexual relationship