Buttons position

I'm developing a "dictionary-like" app, with a list of lemmas, definitions and other infos. I was thinking about the wasted spaces for the footbar (1st image). It could be annoying in case of long scrollable pages (all those pages are pretty long).

So maybe I can find a way to completely remove that fixed footbar. In this context, I'm pretty sure a star icon means "add to bookmarks" to the avg users (so maybe there is no need to add a description "bookmark"). The "graph" icon can be moved too. Those are 3 options, which one do you prefer?

Edit: I changed the screenshots, the previous ones hadn't the share icon. I also added a 3rd option for the graph button.