Page Title Different Than Nav-Link

I am trying to set the title of the page different than the link title in the navigation but I cannot see how to do it. (there are a few plugins that allow a custom title tag but I want to change the link title itself).

There the page title in <h1> tags on the page might be : “A Very Long Page Title With A Few Keywords In it” . But in the navigation the link would be just “Keywords”.

Thx.