Good question. I was able to find some info:http://www.universetoday.com/13757/how- ... anets-get/
What’s the largest possible rocky planet? For this I put in an email to Dr. Sean Raymond, a post doctoral researcher at the Center for Astrophysics and Space Astronomy (CASA) at the University of Colorado. Here’s what he had to say: “The largest “terrestrial” planet is generally considered the one before you get too thick of an atmosphere, which happens at about 5-10 Earth masses (something like 2 Earth radii). Those planets are more Earth-like than Neptune-like.” https://en.wikipedia.org/wiki/Super-Earth
The term Super-Earth also is used by astronomers to define planets bigger than Earth-like planets (from 0.8 Earth-radii till 1.25), but smaller than mini-Neptunes (from 2 Earth-radii till 4). This definition was made by the Kepler Mission.