Operating system is more than the kernel. I do consider for example Arch and Ubuntu to be different operating systems although both use Linux as their kernel.

Operating system is more than the kernel. I do consider for example Arch and Ubuntu to be different operating systems although both use Linux as their kernel. Perhaps some people consider the kernel to be the OS and the userland to be whatever else. I am much more bent towards the thought of an actual distribution being the OS, and the underlying kernel being just one part of the OS as a whole.