Somebody on the radio said there's a big difference between apparent heir and heir apparent. Most people, she said, mean apparent heir when they say heir apparent.
Her explanation was this:
(1) an apparent heir is someone who it appears will or is likely to inherit a position, such as an executive VP expected to take over when a chief executive retires or dies.
(2) an heir apparent is someone who has a right to succeed someone if they outlive the incumbent, such as the line of succession in a monarchy., i.e., Prince Charles was the heir apparent to Queen Elizabeth.
was this commentator nitpicking or, if she's right, is it a distinction worth making?