ringworm vs fungal infection

ringworm and fungal infection both are nouns.

Word	Noun	Adjective	Verb	Adverb
ringworm	Yes	No	No	No
fungal infection	Yes	No	No	No

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

ringworm: infections of the skin or nails caused by fungi and appearing as itching circular patches
fungal infection: an inflammatory condition caused by a fungus

Other hypernyms of ringworm include mycosis.

ringworm (noun)	fungal infection (noun)
infections of the skin or nails caused by fungi and appearing as itching circular patches	an inflammatory condition caused by a fungus