spermatocele vs swelling

spermatocele and swelling both are nouns.

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

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

spermatocele: a swelling on the epididymis or the testis; usually contains spermatozoa
swelling: an abnormal protuberance or localized enlargement

Other hypernyms of spermatocele include lump, puffiness.

spermatocele (noun)	swelling (noun)
a swelling on the epididymis or the testis; usually contains spermatozoa	the increase in volume of certain substances when they are heated (often accompanied by release of water)
	something that bulges out or is protuberant or projects from its surroundings
	an abnormal protuberance or localized enlargement