love affair vs intrigue

love affair and intrigue both are nouns.

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

As nouns, intrigue is a hyponym of love affair; that is, intrigue is a word with a more specific, narrower meaning than love affair:

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

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