We can see that in this example the premise entails the hypothesis, and in order to correctly identify this relation, one has to know that the word kettle entails the word pot.
if we train a neural network model on a set of labeled sentence pairs, and if the training dataset does not contain the word pair kettle and pot anywhere, it would be hard for the learned model to know that kettle entails pot and subsequently predict the relation between the premise and the hypothesis to be entailment.