onycholysis vs onychosis

onycholysis and onychosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
onycholysis	Yes	No	No	No
onychosis	Yes	No	No	No

As nouns, onychosis is a hypernym of onycholysis; that is, onychosis is a word with a broader meaning than onycholysis:

onycholysis: separation of a nail from its normal attachment to the nail bed
onychosis: any disease or disorder of the nails

onycholysis (noun)	onychosis (noun)
separation of a nail from its normal attachment to the nail bed	any disease or disorder of the nails