Linux is nothing but the Linux kernel.
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However, term Linux is used to describe Linux as an an operating system. The term Linux distribution is used to refer to the various operating systems built on top of the Linux Kernel.
§ Linux = a Kernel (no shell, browsers, compiler included or installer to install it on the system)
§ Linux = The term used to describe UNIX like free and open source operating system.
§ Linux Distribution = a Linux kernel + Shell + Browsers + GUI + Media Players + Tons of other apps +Installer etc. In short, various operating systems built on top of the Linux Kernel. Red Hat, Debian or Gentoo all are Linux distribution built on top of the Linux kernel.