spit vs spit out

spit is a noun but spit out is not a noun.

Word	Noun	Adjective	Verb	Adverb
spit	Yes	No	Yes	No
spit out	No	No	Yes	No

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

Other hypernyms of spit include cough out, cough up, expectorate, spit up.

As verbs, spit and spit out are synonyms defined as:

spit (noun)	spit out (noun)
the act of spitting (forcefully expelling saliva)
a skewer for holding meat over a fire
a clear liquid secreted into the mouth by the salivary glands and mucous glands of the mouth; moistens the mouth and starts the digestion of starches
a narrow strip of land that juts out into the sea

spit (verb)	spit out (verb)
expel or eject (saliva or phlegm or sputum) from the mouth	spit up in an explosive manner
utter with anger or contempt	discharge (phlegm or sputum) from the lungs and out of the mouth
drive a skewer through	utter with anger or contempt
rain gently