worriment vs difficultness

worriment and difficultness both are nouns.

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

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

worriment: a difficulty that causes anxiety
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 worriment include difficulty.

worriment (noun)	difficultness (noun)
a difficulty that causes anxiety	the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result