roundworm vs mycosis

roundworm and mycosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
roundworm	Yes	No	No	No
mycosis	Yes	No	No	No

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

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

Other hypernyms of roundworm include fungal infection.

roundworm (noun)	mycosis (noun)
unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic	an inflammatory condition caused by a fungus
infections of the skin or nails caused by fungi and appearing as itching circular patches