hush vs silence

hush and silence both are nouns.

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

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

Other hypernyms of hush include quiet.

As verbs, hush and silence are synonyms defined as:

Other synonyms of hush include hush up, quieten, shut up, still.

hush (noun)	silence (noun)
(poetic) tranquil silence	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)

hush (verb)	silence (verb)
become quiet or still; fall silent	cause to be quiet or not talk
cause to be quiet or not talk	keep from expression, for example by threats or pressure
run water over the ground to erode (soil), revealing the underlying strata and valuable minerals
wash by removing particles
become quiet or quieter