 This general moral seems right. It is worryingly easy to deflect a counter-example or to explain an intuition by claiming differences in meaning. On the other hand, in philosophical discourse, distinctions that are quite fine can be made that may well be missed by normal users of the language who are inclined to miss differences in meaning that are slight. One thus often will be tempted to posit ambiguity as a way to reconcile differences between two plausible hypotheses about the meanings of words and phrases (‘evidence’ has both an internal sense and an external sense, ‘right action’ has both a utilitarian sense and a deontic sense…) A neat case of this is Gilbert Ryle’s contention that ‘exists’ is ambiguous mentioned above: