jock itch vs roundworm

jock itch and roundworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
jock itch	Yes	No	No	No
roundworm	Yes	No	No	No

As nouns, roundworm is a hypernym of jock itch; that is, roundworm is a word with a broader meaning than jock itch:

jock itch: fungal infection of the groin (most common in men)
roundworm: infections of the skin or nails caused by fungi and appearing as itching circular patches

Other hypernyms of jock itch include ringworm, tinea.

jock itch (noun)	roundworm (noun)
fungal infection of the groin (most common in men)	unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic
	infections of the skin or nails caused by fungi and appearing as itching circular patches