Full Idea
The difference between logical and metaphysical necessities lies, not in the range of possibilities for which they hold, but - at the linguistic level - in the kind of vocabulary essential to their expression, and the kinds of entities that explain them.
Gist of Idea
Logical and metaphysical necessities differ in their vocabulary, and their underlying entities
Source
Bob Hale (Necessary Beings [2013], 04.5)
Book Reference
Hale,Bob: 'Necessary Beings' [OUP 2013], p.115
A Reaction
I don't think much of the idea that the difference is just linguistic, and I don't like the idea of 'entities' as grounding them. I see logical necessities as arising from natural deduction rules, and metaphysical ones coming from the nature of reality.