betrayer vs two-timer

betrayer and two-timer both are nouns.

Word	Noun	Adjective	Verb	Adverb
betrayer	Yes	No	No	No
two-timer	Yes	No	No	No

As nouns, betrayer and two-timer are synonyms defined as:

Other synonyms of betrayer include double-crosser, double-dealer, traitor.

betrayer (noun)	two-timer (noun)
a person who says one thing and does another	a person who says one thing and does another
one who reveals confidential information to the police or other authority	someone who deceives a lover or spouse by carrying on a sexual relationship with somebody else