I would not expect dictionary-level consistency from it. Even humans freely use words differently in different contexts, and it would be particularly unfair to

I would not expect dictionary-level consistency from it. Even humans freely use words differently in different contexts, and it would be particularly unfair to hold it against ChatGPT for getting creative when asked to find the similarities between two radically different objects. If anything, this answer is extraordinarily impressive because, although it decided to be a stickler for definitions this time, it reaffirms the metaphor that it invented last time. In other words, it seems reasonable to conclude that in some sense it "knows" that the barrel of the cannon expands slightly (a fact it implied but neglected to mention last time), and can use this to make inferences.