spit out vs spit up

spit out and spit up both are verbs.

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

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

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

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

spit out and spit up: discharge (phlegm or sputum) from the lungs and out of the mouth

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

spit out (verb)	spit up (verb)
spit up in an explosive manner	discharge (phlegm or sputum) from the lungs and out of the mouth
discharge (phlegm or sputum) from the lungs and out of the mouth	give reluctantly
utter with anger or contempt