bleat vs let out

bleat is a noun but let out is not a noun.

Word	Noun	Adjective	Verb	Adverb
bleat	Yes	No	Yes	No
let out	No	No	Yes	No

As verbs, let out is a hypernym of bleat; that is, let out is a word with a broader meaning than bleat:

Other hypernyms of bleat include emit, let loose, utter.

bleat (noun)	let out (noun)
the sound of sheep or goats (or any sound resembling this)

bleat (verb)	let out (verb)
cry plaintively	make (clothes) larger
talk whiningly	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
	express audibly; utter sounds (not necessarily words)
	bring out of a specific state