barber's itch vs roundworm

barber's itch and roundworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
barber's itch	Yes	No	No	No
roundworm	Yes	No	No	No

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

barber's itch: fungal infection of the face and neck
roundworm: infections of the skin or nails caused by fungi and appearing as itching circular patches

Other hypernyms of barber's itch include ringworm, tinea.

barber's itch (noun)	roundworm (noun)
fungal infection of the face and neck	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