Adding another word in front of post url

I have a wordpress website with bunch of posts.
My problem is that I need to change the URLs from

website.com/post-name

to

website.com/specialword/post-name

The “specialword” is what I need to add in front of those post names, but ONLY for the post type – posts.

Can someone help me?

I need this badly, mostly because of the SEO purposes so I can keep the URLs from the previous website that wasn’t done in wordpress.

Thank you!
Slavisa

You can do it from Settings > Permalinks.

Select the Custom Structure radio button, and put this in the text field next to it:

/myspecialword/%postname%

Works.