valley fever vs mycosis

valley fever and mycosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
valley fever	Yes	No	No	No
mycosis	Yes	No	No	No

As nouns, mycosis is a hypernym of valley fever; that is, mycosis is a word with a broader meaning than valley fever:

valley fever: an infection of the lungs and skin characterized by excessive sputum and nodules
mycosis: an inflammatory condition caused by a fungus

Other hypernyms of valley fever include fungal infection.

valley fever (noun)	mycosis (noun)
an infection of the lungs and skin characterized by excessive sputum and nodules	an inflammatory condition caused by a fungus