intrigue vs love affair

intrigue and love affair both are nouns.

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

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

Other hypernyms of intrigue include romance.

intrigue (noun)	love affair (noun)
a crafty and involved plot to achieve your (usually sinister) ends	a relationship between two lovers
a clandestine love affair

intrigue (verb)	love affair (verb)
form intrigues (for) in an underhand manner
cause to be interested or curious