categories – how to delete pages that load with archive templates

I have a custom message type "project"
And it loads with the template "archive-project"

I already have an "applications" page to load "archive-project"

So the same page is accessible via both URLs

www.website.com/project
www.website.com/applications

I've tried a "Smart Archive Page Remove" plugin, which does not work for me.

How to remove www.website.com/project?

Please help.