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Red is indeed a color as black or blue or white.
Red is often associated to fire, blood, the devil(satan, the red dragon), or the color of shame.
And also in the infrared wavelenght, that allow to see throught things according to the heat/cold signature.
blood is only reddish when viewed as a thin layer (it’s more dark red/dark purple/black when you have a thick sample)
electromagnetic waves with wavelengths between ~-nm are considered “red”
visible red light has a wavelength of about nm
It is a word that could mean more than one thing – color, name of a person, rage,….
It’s a color. The color of blood, for example.