muddle vs difficultness

muddle and difficultness both are nouns.

Word	Noun	Adjective	Verb	Adverb
muddle	Yes	No	Yes	No
difficultness	Yes	No	No	No

As nouns, difficultness is a hypernym of muddle; that is, difficultness is a word with a broader meaning than muddle:

muddle: informal terms for a difficult situation
difficultness: the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result

Other hypernyms of muddle include difficulty.

muddle (noun)	difficultness (noun)
a confused multitude of things	the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result
informal terms for a difficult situation

muddle (verb)	difficultness (verb)
mix up or confuse
make into a puddle