ankylosis vs anchylosis

ankylosis and anchylosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
ankylosis	Yes	No	No	No
anchylosis	Yes	No	No	No

As nouns, ankylosis and anchylosis are synonyms defined as:

ankylosis and anchylosis: abnormal adhesion and rigidity of the bones of a joint

ankylosis (noun)	anchylosis (noun)
abnormal adhesion and rigidity of the bones of a joint	abnormal adhesion and rigidity of the bones of a joint