Noun betrayer has 2 senses
  1. informer, betrayer, rat, squealer, blabber - one who reveals confidential information in return for money
    --1 is a kind of informant, source
    --1 has particulars:
     fink, snitch, snitcher, stoolpigeon, stoolie, sneak, sneaker, canary; nark, copper's nark; supergrass
    Derived forms: verb betray2, verb betray5
  2. double-crosser, double-dealer, two-timer, betrayer, traitor - a person who says one thing and does another
    --2 is a kind of deceiver, cheat, cheater, trickster, beguiler, slicker
    --2 has particulars: Judas
    Derived form: verb betray6
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