This is my perspective on it...
Plot hooks are envisioned as more of a collection of story fragments that represent pending ideas you may want to include in your campaign. Storylines are envisioned as @MNBlockhead described them above. So a storyline is something concretely integrated into your campaign, usually woven across lots of different aspects of the campaign and encompassing many scenes, while plot hooks are isolated ideas that are not yet officially part of the campaign but may ultimately be pulled from to create storylines.
Hope this helps!
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