Looking for a plugin for a movie review website

Hello everyone,

I am running a movie review website.
Now whenever I review a movie with an actor, who starred in another movie which I have reviewed, I usually link to the other post manually.

Now I wonder is there an way to do this? I know that I could have tags but the tags are reserved for movie topics only.
Is there a plugin which lets me link between pages somehow?
Maybe a plugin which underlines certain names and then leads the reader to a list of posts including that name?

I hope my post was somewhat understable. If not, just let me know and I’ll try to explain again ??

Any suggestions are appreciated.