swell up vs puff up

swell up and puff up both are verbs.

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

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

Other hyponyms of swell up include distend, belly, belly out, blow up, puff, puff out, bloat, blister, vesicate.

swell up (verb)	puff up (verb)
expand abnormally	make larger or distend
	to swell or cause to enlarge
	praise extravagantly
	become filled with pride, arrogance, or anger