pisser vs difficulty

pisser and difficulty both are nouns.

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

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

pisser: a very disagreeable difficulty
difficulty: 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 pisser include difficultness.

pisser (noun)	difficulty (noun)
a very disagreeable difficulty	an effort that is inconvenient
a person who urinates	the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result