tinea unguium vs roundworm

tinea unguium and roundworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
tinea unguium	Yes	No	No	No
roundworm	Yes	No	No	No

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

tinea unguium: fungal infection of the nails (especially toenails)
roundworm: infections of the skin or nails caused by fungi and appearing as itching circular patches

Other hypernyms of tinea unguium include ringworm, tinea.

tinea unguium (noun)	roundworm (noun)
fungal infection of the nails (especially toenails)	unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic
	infections of the skin or nails caused by fungi and appearing as itching circular patches