There is software called WordNet, which essentially classifies every English word in a complex class hierarchy and has built-in software for it that can take two words and return its early common superclass (hyper-name in the wordnet language).
In this case, a query for the word red will return something like
red, redness
=> chromatic color, chromatic colour, spectral color, spectral colour
=> color, colour, coloring, colouring
=> visual property
=> property
=> attribute
=> abstraction, abstract entity
=> entity
The query for blue gives
blue, blueness
=> chromatic color, chromatic colour, spectral color, spectral colour
=> color, colour, coloring, colouring
=> visual property
=> property
=> attribute
=> abstraction, abstract entity
=> entity
So, you know, the most accurate way to describe red or blue is "color color"
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