botcher vs sad sack

botcher and sad sack both are nouns.

Word	Noun	Adjective	Verb	Adverb
botcher	Yes	No	No	No
sad sack	Yes	No	No	No

As nouns, botcher and sad sack are synonyms defined as:

botcher and sad sack: someone who makes mistakes because of incompetence

Other synonyms of botcher include blunderer, bumbler, bungler, butcher, fuckup, fumbler, stumbler.

botcher (noun)	sad sack (noun)
someone who makes mistakes because of incompetence	someone who makes mistakes because of incompetence