falter vs stumble

falter and stumble both are nouns.

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

As verbs, falter and stumble are synonyms defined as:

Other synonyms of falter include bumble.

falter (noun)	stumble (noun)
the act of pausing uncertainly	an unsteady uneven gait
	an unintentional but embarrassing blunder

falter (verb)	stumble (verb)
speak haltingly	make an error
walk unsteadily, tripping repeatedly	miss a step and fall or nearly fall
move hesitatingly, as if about to give way	walk unsteadily, tripping repeatedly
be unsure or weak	encounter by chance