An Adjective can, in general, be converted to Comparative (-er) & Superlative (-est) ; for example :
good better best
happy happier happiest
Now Superlative means "Highest in quality", or has positive connotations.
In some cases, the quality is lowest, or has negative connotations.
bad worse worst
sad sadder saddest
(A) Is there a Different way to refer to Superlative in the negative ?
It seems odd/self-contradictory to use "negative superlatives".
(B) Is there a term for the ordering of the 6 words from most-negative to most-positive, like the following ?
worst worse bad good better best
saddest sadder sad happy happier happiest
EDIT: I wish to add some points regarding the positive and negative connotations.
Consider the situation where a movie-maker asks "Was there a good turn-out for my movie ?" and the theatre owner replies "We had a full house !", and the movie-maker exclaims "Superlative !"
Consider another situation where a building-owner asks "Was there much damage to my building in the fire ?" and the watchman replies "It was destroyed completely !", where we can hardly expect the building-owner to reply with "Superlative !"
I came up with a new word to express negative superlative : "Infralative", though it may not catch up with the masses.
Best Answer
Surely a Latinate solution would be "sublative" not "infralative". (Super-sub, supra-infra.) Hideous coinage, though, and not likely to be understood.
And one devoutly hopes that the interjection "Superlative!" will go the same way as "the bee's knees".
Marking up Janus' big comment, which cannot be bettered, or even superlativised.