What's the difference between linearly polarised and plane-polarised waves?

To explain polarisation, my book gives an example of a transverse wave in a string, and explains as:

Since each point on the string moves on a straight line, the wave is also referred to as a linearly polarised wave. Further, the string always remains confined to the x-y plane and therefore it is also referred to as a plane polarised wave

The image given is somewhat like this: The definitions for both these terms are different, so it seems to me that they are not same. But I wasn't able to find an example which illustrates the difference between these two.

I found this Quora question, but the answers don't seem convincing.

So what exactly is the difference between a linearly polarised wave and a plane-polarised wave? Because according to me, a linearly polarised wave will oscillate in only one plane.

• I've always taken them as synonymous. The main distinction is between plane [linear] and circularly polarized light, which doesn't oscillate in any one plane. – Jonathan Stott Feb 22 at 21:22
• linear polarisation only talks about direction of oscillation of electric field for example y polarised light has it electric field amplitude only in y-direction and it direction propogation is not specified . we need plane of polarisation to specify a waves oscillation as well as direction of propogation. y polarised light can propogate in x-direction or in z- direction. this distinction (linear polarisation and plane polarisation ) is required to know direction of oscillation as well as direction of propogation – teja Jun 3 at 6:06