swelling vs wart

swelling and wart both are nouns.

Word	Noun	Adjective	Verb	Adverb
swelling	Yes	No	No	No
wart	Yes	No	No	No

As nouns, wart is a hyponym of swelling; that is, wart is a word with a more specific, narrower meaning than swelling:

swelling: something that bulges out or is protuberant or projects from its surroundings
wart: any small rounded protuberance (as on certain plants or animals)

Other hyponyms of swelling include frontal eminence, occipital protuberance, belly, caput, mogul, nub, nubble, snag.

swelling (noun)	wart (noun)
the increase in volume of certain substances when they are heated (often accompanied by release of water)	(pathology) a firm abnormal elevated blemish on the skin; caused by a virus
something that bulges out or is protuberant or projects from its surroundings	any small rounded protuberance (as on certain plants or animals)
an abnormal protuberance or localized enlargement	an imperfection in someone or something that is suggestive of a wart (especially in smallness or unattractiveness)