love feast vs affair

love feast and affair both are nouns.

Word	Noun	Adjective	Verb	Adverb
love feast	Yes	No	No	No
affair	Yes	No	No	No

As nouns, affair is a hypernym of love feast; that is, affair is a word with a broader meaning than love feast:

love feast: a social gathering intended to create goodwill among the participants
affair: a formal or official social gathering or ceremony of people

Other hypernyms of love feast include function, occasion, social affair, social function, social gathering, social occasion.

love feast (noun)	affair (noun)
a religious meal shared as a sign of love and fellowship	a vaguely specified concern
a social gathering intended to create goodwill among the participants	a formal or official social gathering or ceremony of people
	a usually secretive or illicit sexual relationship