stammer vs falter

stammer and falter both are nouns.

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

As verbs, stammer and falter are synonyms defined as:

Other synonyms of stammer include bumble, stutter.

stammer (noun)	falter (noun)
a speech disorder involving hesitations and involuntary repetitions of certain sounds	the act of pausing uncertainly

stammer (verb)	falter (verb)
speak haltingly	speak haltingly
	walk unsteadily, tripping repeatedly
	move hesitatingly, as if about to give way
	be unsure or weak