spit up vs eject

spit up and eject both are verbs.

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

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

Other hypernyms of spit up include discharge, exhaust, expel, release.

spit up (verb)	eject (verb)
discharge (phlegm or sputum) from the lungs and out of the mouth	eliminate (a substance)
give reluctantly	cause to come out in a squirt
	put out or expel from a place
	leave an aircraft rapidly, using an ejection seat or capsule