dumb vs silent

dumb and silent both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dumb	No	Yes	No	No
silent	No	Yes	No	No

As adjectives, dumb and silent are synonyms defined as:

Other synonyms of dumb include mute.

dumb (adjective)	silent (adjective)
slow to learn or understand; lacking intellectual acuity	implied by or inferred from actions or statements
unable to speak because of hereditary deafness	unable to speak because of hereditary deafness
temporarily incapable of speaking	having a frequency below or above the range of human audibility
lacking the power of human speech	marked by absence of sound
	failing to speak or communicate etc when expected to
	not made to sound
	expressed without speech