Putnam's twin earth argument presupposes semantic externalism, but internalists like Searle argue that reference is fixed by descriptive content, meaning XYZ could be 'water' if it plays the same functional role.

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Internalism(Moral psychology; used to characterize the relationship between moral judgment and motivation): The view that it is a logical or conceptual truth that some degree of motivation is internal to a moral judgment itself — that making a genuine moral claim entails being motivated to some degree.
John Searle(as the philosopher being referenced): An influential American philosopher who studies how minds work, language functions, and how people cooperate; he argues that collective intentions are fundamentally different from just combining individual ones.
Putnam's twin earth argument(in philosophy of language and meaning): A famous thought experiment by philosopher Hilary Putnam where he imagines a planet identical to Earth except its oceans contain a different chemical (XYZ instead of H2O), used to argue that the meaning of words depends on the real world, not just what's in our heads.
descriptive content(Putnam's characterization, contrasted with causal theories of reference)

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