Two-timer and Turncoat

Two-timer noun - Someone who deceives a lover or spouse by carrying on a sexual relationship with somebody else.

Turncoat and two-timer are semantically related in traitor topic. In some cases you can use "Turncoat" instead a noun phrase "Two-timer", when it comes to topics like person who is disloyal.

Turncoat noun - One who betrays a trust or an allegiance.

Two-timer and turncoat are semantically related in traitor topic. You can use "Two-timer" instead a noun "Turncoat".