amour vs affaire

amour and affaire both are nouns.

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

As nouns, amour and affaire are synonyms defined as:

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

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