bungler vs blunderer

bungler and blunderer both are nouns.

Word	Noun	Adjective	Verb	Adverb
bungler	Yes	No	No	No
blunderer	Yes	No	No	No

As nouns, bungler and blunderer are synonyms defined as:

bungler and blunderer: someone who makes mistakes because of incompetence

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

bungler (noun)	blunderer (noun)
someone who makes mistakes because of incompetence	someone who makes mistakes because of incompetence