love affair vs romance

love affair and romance both are nouns.

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

As nouns, love affair and romance are synonyms defined as:

love affair (noun)	romance (noun)
a relationship between two lovers	an exciting and mysterious quality (as of a heroic time or adventure)
	a novel dealing with idealized events remote from everyday life
	a story dealing with love
	a relationship between two lovers

love affair (verb)	romance (verb)
	tell romantic or exaggerated lies
	talk or behave amorously, without serious intentions
	have a love affair with
	make amorous advances towards