Hurgh and SuD are both verbs, so you can't put them in the same sentence without some sort of marker to connect them. SuD 'ej Hurgh generally refers to the darker end of the "cool" spectrum - what we might call "dark blue". There is a theory that klingons cannot see purple, or at least cannot perceive it as a single color and the only way we have to describe it is Doq 'ej SuD.
If that's true, that means that Klingons are color blind - they must either have deuteranopia or deuteranomaly!
Not so much colour blind as just having developed vision in a different spectral range. In one of the novels, I think it's Pawns and Symbols, a DIvI' crew discovers that Klingons can't see red. A Klingon enters a restricted area and doesn't understand how he was supposed to know that a plain black door designated restricted. The signage was black on red. In the novel, the Klingon can see two colours into the ultraviolet, colours he calls kalish and amarklor. Either way, it's a difference not a deficiency. Neither the gymnast who can't deadlift double her weight, nor the powerlifter who can't do a back walkover on a balance beam is physically inept.
That novel has been contradicted by more recent canon, by the way. Klingon for the Galactic Traveler says, "The fact that neither SuD nor Doq includes what is called ‘violet’ or ‘purple’ in Federation Standard may be related to Klingon physiology—that is, exactly how the Klingon eye processes different wavelengths of light," suggesting that Klingon vision might be skewed the other way (especially since Klingons DO have words for both 'red' and 'black').