epiphysis vs epiphysial

epiphysis is a noun but epiphysial is not a noun.

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

epiphysis (noun)	epiphysial (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

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