stumble vs stumbler

stumble and stumbler both are nouns.

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

stumble (noun)	stumbler (noun)
an unsteady uneven gait	a walker or runner who trips and almost falls
an unintentional but embarrassing blunder	someone who makes mistakes because of incompetence

stumble (verb)	stumbler (verb)
make an error
miss a step and fall or nearly fall
walk unsteadily, tripping repeatedly
encounter by chance