swelling vs iridoncus

swelling and iridoncus both are nouns.

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

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

swelling (noun)	iridoncus (noun)
the increase in volume of certain substances when they are heated (often accompanied by release of water)	swelling of the iris of the eye
something that bulges out or is protuberant or projects from its surroundings
an abnormal protuberance or localized enlargement