scream vs emit

scream is a noun but emit is not a noun.

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

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

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

scream (noun)	emit (noun)
sharp piercing cry
a joke that seems extremely funny
a high-pitched noise resembling a human cry

scream (verb)	emit (verb)
utter a sudden loud cry	expel (gases or odors)
utter or declare in a very loud voice	express audibly; utter sounds (not necessarily words)
make a loud, piercing sound	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.