“Plant milk” could be a bit like “berry” though, in that as we have consolidated and rationalised our definitions it falls out of it. When we tried to come up with a clear idea of what a “berry” is we ended up excluding almost everything that has “berry” in the name. Like how tomatoes are fruits by the technical definition of a fruit.

Except for the fact that the reason plant milk is being excluded is entirely commercial lobbying, rather than a scientific or rational definition.