swell vs distend

swell is a noun but distend is not a noun.

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

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

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

swell (noun)	distend (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)	distend (adjective)
excellent

swell (verb)	distend (verb)
expand abnormally	become wider
cause to become swollen	swell from or as if from internal pressure
increase in size, magnitude, number, or intensity	cause to expand as if by internal pressure
come up, as of a liquid
become filled with pride, arrogance, or anger
come up (as of feelings and thoughts, or other ephemeral things)