muteness vs mutism

muteness and mutism both are nouns.

Word	Noun	Adjective	Verb	Adverb
muteness	Yes	No	No	No
mutism	Yes	No	No	No

As nouns, muteness and mutism are synonyms defined as:

muteness and mutism: the condition of being unable or unwilling to speak

muteness (noun)	mutism (noun)
a refusal to speak when expected	the condition of being unable or unwilling to speak
the condition of being unable or unwilling to speak