The creation of a uniform terminology is practically impossible, because breeders ( poultry , parrots and canaries) use different terminology. Another problem is that some species have specific mutations.
For me, more important than the name, is to understand the mechanism of mutation and how its transmission to offspring. Nomenclature of mutations, is a theoretical problem. Therefore, simpler is use the term: color variety
The names of the color varieties can be created freely. The privilege is reserved to the the breeder who first created a new variety.