Change Portfolio name to something else


I have two different blogs that users could subscribe to. One blog is placed under 'Posts' and the other is placed under 'Portfolio'. I have done it this way as when you have two different blog categories under 'Posts' you are not able to choose which blog you can subscribe to.

I would prefer to have the 'Portfolio' name being called something else as it isn't a portfolio. Please let me know how I would be able to change this.