epiphysial vs epiphysis

epiphysial is not a noun while epiphysis is a noun.

Word	Noun	Adjective	Verb	Adverb
epiphysial	No	Yes	No	No
epiphysis	Yes	No	No	No

epiphysial (noun)	epiphysis (noun)
	the end of a long bone; initially separated from the main bone by a layer of cartilage that eventually ossifies so the parts become fused
	a small endocrine gland in the brain; situated beneath the back part of the corpus callosum; secretes melatonin

epiphysial (adjective)	epiphysis (adjective)
relating to the epiphysis of a bone