swell vs tumefy

swell is a noun but tumefy is not a noun.

Word	Noun	Adjective	Verb	Adverb
swell	Yes	Yes	Yes	No
tumefy	No	No	Yes	No

As verbs, swell and tumefy are synonyms defined as:

Other synonyms of swell include intumesce, swell up, tumesce.

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

Other hyponyms of swell include bulge, bulk, bloat.

swell (noun)	tumefy (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

swell (adjective)	tumefy (adjective)
excellent

swell (verb)	tumefy (verb)
expand abnormally	expand abnormally
cause to become swollen	cause to become very 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)