speechlessness vs silence

speechlessness and silence both are nouns.

Word	Noun	Adjective	Verb	Adverb
speechlessness	Yes	No	No	No
silence	Yes	No	Yes	No

As nouns, silence is a hypernym of speechlessness; that is, silence is a word with a broader meaning than speechlessness:

Other hypernyms of speechlessness include quiet.

speechlessness (noun)	silence (noun)
the property of being speechless	the absence of sound
	a refusal to speak when expected
	the trait of keeping things secret
	the state of being silent (as when no one is speaking)

speechlessness (verb)	silence (verb)
	cause to be quiet or not talk
	keep from expression, for example by threats or pressure