yammer vs emit

yammer and emit both are verbs.

Word	Noun	Adjective	Verb	Adverb
yammer	No	No	Yes	No
emit	No	No	Yes	No

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

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

yammer (verb)	emit (verb)
complain whiningly	expel (gases or odors)
cry loudly, as of animals	express audibly; utter sounds (not necessarily words)
	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.