The term "punch line" is commonly used to refer to the final line of a joke that is intended to be humorous. However, there are other synonyms that can be used to describe this same concept. One such synonym is "climax", which refers to the moment in a story or joke when the tension builds and the payoff is delivered. Another possible synonym is "zinger", which is an unexpected and amusing comment that is usually delivered as the punch line of a joke. Other synonyms for "punch line" include "punch word", "snapper", and "quip". Ultimately, the choice of synonym will depend on the context of the situation and the speaker's personal preference.