double-crosser vs two-timer

double-crosser and two-timer both are nouns.

Word	Noun	Adjective	Verb	Adverb
double-crosser	Yes	No	No	No
two-timer	Yes	No	No	No

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

double-crosser and two-timer: a person who says one thing and does another

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

double-crosser (noun)	two-timer (noun)
a person who says one thing and does another	a person who says one thing and does another
	someone who deceives a lover or spouse by carrying on a sexual relationship with somebody else