shout down vs hush

shout down is not a noun while hush is a noun.

Word	Noun	Adjective	Verb	Adverb
shout down	No	No	Yes	No
hush	Yes	No	Yes	No

As verbs, hush is a hypernym of shout down; that is, hush is a word with a broader meaning than shout down:

Other hypernyms of shout down include hush up, quieten, shut up, silence, still.

shout down (noun)	hush (noun)
	(poetic) tranquil silence

shout down (verb)	hush (verb)
silence or overwhelm by shouting	become quiet or still; fall silent
	cause to be quiet or not talk
	run water over the ground to erode (soil), revealing the underlying strata and valuable minerals
	wash by removing particles
	become quiet or quieter