The category of comparison is constituted by the opposition of three forms of the adjective: the positive, the comparative, and the superlative.
There are three ways of forming degrees of comparison: synthetic, analytic, and suppletive.
The question that linguists have been grappling with is: what is the linguistic status of analytic forms? Are more and most adverbs of quantity (degree) or grammatical word-morphemes?
To analytic forms of comparison M. Blokh also attributes less/least combinations. He calls them forms of reverse comparison.
In discussing the category of comparison, linguists generally mention such constructions as a most beautiful girl. This combination is a common means of expressing elative evaluations of substance properties.