difficulty vs sweat

difficulty and sweat both are nouns.

Word	Noun	Adjective	Verb	Adverb
difficulty	Yes	No	No	No
sweat	Yes	No	Yes	No

As nouns, sweat is a hypernym of difficulty; that is, sweat is a word with a broader meaning than difficulty:

Other hypernyms of difficulty include effort, elbow grease, exertion, travail.

difficulty (noun)	sweat (noun)
an effort that is inconvenient	use of physical or mental energy; hard work
the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result	salty fluid secreted by sweat glands
	condensation of moisture on a cold surface
	agitation resulting from active worry

difficulty (verb)	sweat (verb)
	excrete perspiration through the pores in the skin