blow up vs swell up

blow up and swell up both are verbs.

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

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

Other hypernyms of blow up include intumesce, swell, tumefy, tumesce.

blow up (verb)	swell up (verb)
make large	expand abnormally
exaggerate or make bigger
to swell or cause to enlarge
cause to burst with a violent release of energy
fill with gas or air
burst and release energy as through a violent chemical or physical reaction
add details to
get very angry and fly into a rage