blunderer vs bumbler

blunderer and bumbler both are nouns.

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

As nouns, blunderer and bumbler are synonyms defined as:

blunderer and bumbler: someone who makes mistakes because of incompetence

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

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