spring up vs swell

spring up is not a noun while swell is a noun.

Word	Noun	Adjective	Verb	Adverb
spring up	No	No	Yes	No
swell	Yes	Yes	Yes	No

As verbs, swell is a hyponym of spring up; that is, swell is a word with a more specific, narrower meaning than spring up:

Other hyponyms of spring up include resurge, come forth, emerge, come, follow, well up, head.

spring up (noun)	swell (noun)
	a crescendo followed by a decrescendo
	the undulating movement of the surface of the open sea
	a rounded elevation (especially one on an ocean floor)
	a man who is much concerned with his dress and appearance

spring up (adjective)	swell (adjective)
	excellent

spring up (verb)	swell (verb)
come into existence; take on form or shape	expand abnormally
	cause to become swollen
	increase in size, magnitude, number, or intensity
	come up, as of a liquid
	become filled with pride, arrogance, or anger
	come up (as of feelings and thoughts, or other ephemeral things)