blunderer vs stumbler

blunderer and stumbler both are nouns.

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

As nouns, blunderer and stumbler are synonyms defined as:

blunderer and stumbler: someone who makes mistakes because of incompetence

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

blunderer (noun)	stumbler (noun)
someone who makes mistakes because of incompetence	a walker or runner who trips and almost falls
	someone who makes mistakes because of incompetence