dhobi itch vs ringworm

dhobi itch and ringworm both are nouns.

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

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

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

Other hypernyms of dhobi itch include roundworm, tinea.

dhobi itch (noun)	ringworm (noun)
fungal infection attacking moist parts of the body	infections of the skin or nails caused by fungi and appearing as itching circular patches