onyxis vs ingrown toenail

onyxis and ingrown toenail both are nouns.

Word	Noun	Adjective	Verb	Adverb
onyxis	Yes	No	No	No
ingrown toenail	Yes	No	No	No

As nouns, onyxis and ingrown toenail are synonyms defined as:

onyxis and ingrown toenail: toenail having its free tip or edges embedded in the surrounding flesh

onyxis (noun)	ingrown toenail (noun)
toenail having its free tip or edges embedded in the surrounding flesh	toenail having its free tip or edges embedded in the surrounding flesh