blunderer vs fumbler

blunderer and fumbler both are nouns.

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

As nouns, blunderer and fumbler are synonyms defined as:

blunderer and fumbler: someone who makes mistakes because of incompetence

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

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