Betray verb - To be unfaithful or disloyal to.
Usage example: childhood friends of movie stars often betray them by telling their secrets to the supermarket tabloids
Tell is a synonym for betray in reveal topic. In some cases you can use "Tell" instead a verb "Betray", when it comes to topics like show, acknowledgement, divulge, give away.
Tell verb - To make known (as information previously kept secret).
Usage example: I won't tell your secret to anyone
Betray is a synonym for tell in show topic. You can use "Betray" instead a verb "Tell", if it concerns topics such as acknowledgement, reveal.
Both words in one sentence
- His mistreat of Juliet and Alex give them the motivation to betray him and tell the survivors of the incoming attack, which allows them to properly defend.
Source: Series / Lost
- Similarly, never tell Cohen the Barbarian that you would "rather die than betray my emperor".
- He'll betray you, but he won't tell your enemies all they really need to know about you.
Source: Lovable Traitor
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Google Ngram Viewer shows how "betray" and "tell" have occurred on timeline