This is a trick question. If one is known, or a fact is known, then it is KNOWN. Like the word "unique." There is no more unique or most unique. Unique means one of a kind.
So, in theory, more well known or most well known could suffice; but the term would be redundant.
The comparative degree is wider.
Oh, dude, you're hitting me with some grammar stuff! So, the comparative degree of "biggest" is "bigger." Like, you know, if something is big, and then you compare it to something else, you'd say it's "bigger." It's like saying, "This burrito is big, but that burrito is even bigger."
busier..
keener
lesser
"Less" is the comparative degree of little.
The comparative degree is wider.
Teapot is a noun and, as such, does not have a comparative degree.
The comparative degree of "holy" is "holier."
Thriftier is the comparative degree of thrifty.
The comparative degree for "lush" is "lusher."
The comparative degree of "light" is "lighter."
better for its comparative and best for its superlative
"Speed" is a noun and a verb and, as such, does not have a comparative degree. The comparative of the adjective speedy is speedier.
"Less" is the comparative degree of little. The superlative degree is least.
The comparative degree of "sad" is "sadder."
"Message" is a noun and (these days) a verb and, as such, does not have a comparative degree.