dhobi itch vs roundworm

dhobi itch and roundworm both are nouns.

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

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

dhobi itch: fungal infection attacking moist parts of the body
roundworm: infections of the skin or nails caused by fungi and appearing as itching circular patches

Other hypernyms of dhobi itch include ringworm, tinea.

dhobi itch (noun)	roundworm (noun)
fungal infection attacking moist parts of the body	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