hush vs quieten

hush is a noun but quieten is not a noun.

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

As verbs, hush and quieten are synonyms defined as:

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

As verbs, hush and quieten are synonyms defined as:

Other synonyms of hush include pipe down, quiesce, quiet, quiet down.

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

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