tinea cruris vs ringworm

tinea cruris and ringworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
tinea cruris	Yes	No	No	No
ringworm	Yes	No	No	No

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

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

Other hypernyms of tinea cruris include roundworm, tinea.

tinea cruris (noun)	ringworm (noun)
fungal infection of the groin (most common in men)	infections of the skin or nails caused by fungi and appearing as itching circular patches