expectorate vs spit up

expectorate and spit up both are verbs.

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

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

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

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

expectorate (verb)	spit up (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
clear out the chest and lungs	give reluctantly