swelling vs enlargement

swelling and enlargement both are nouns.

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

As nouns, enlargement is a hypernym of swelling; that is, enlargement is a word with a broader meaning than swelling:

Other hypernyms of swelling include symptom.

swelling (noun)	enlargement (noun)
the increase in volume of certain substances when they are heated (often accompanied by release of water)	the act of increasing (something) in size or volume or quantity or scope
something that bulges out or is protuberant or projects from its surroundings	a photographic print that has been enlarged
an abnormal protuberance or localized enlargement	a discussion that provides additional information
	the state of being enlarged