yammer vs let loose

yammer and let loose both are verbs.

Word	Noun	Adjective	Verb	Adverb
yammer	No	No	Yes	No
let loose	No	No	Yes	No

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

Other hypernyms of yammer include emit, let out, utter.

yammer (verb)	let loose (verb)
complain whiningly	express audibly; utter sounds (not necessarily words)
cry loudly, as of animals	turn loose or free from restraint