spit up vs cough out

spit up and cough out both are verbs.

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

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

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

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

spit up (verb)	cough out (verb)
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