This is the 618th most frequent Hindi word.
जहर
Poison.
In this sentence 'जहर' refers to the poison secreted by the snake used as a noun.
साँप ने जहर से भरा डंक मारा।
The snake delivered a venomous bite.
Here 'जहर' metaphorically means 'bitterness' or 'hatred', highlighting negative emotions in speech.
उसकी बातों में इतना जहर क्यों है?
Why is there so much venom in his words?
In this instance, 'जहर' denotes a chemical substance that can cause harm or death, used in a literal sense.