Jailbird and Rat

Jailbird noun – A person convicted as a criminal and serving a prison sentence.

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Rat and jailbird are semantically related. in immoral topic. In some cases you can use "Rat" instead a noun "Jailbird".

Rat noun – A person who provides information about another's wrongdoing.

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Jailbird and rat are semantically related. Sometimes you can use "Jailbird" instead a noun "Rat".