apheresis vs apheretic

apheresis is a noun but apheretic is not a noun.

Word	Noun	Adjective	Verb	Adverb
apheresis	Yes	No	No	No
apheretic	No	Yes	No	No

apheresis (noun)	apheretic (noun)
a procedure in which blood is drawn and separated into its components by dialysis; some are retained and the rest are returned to the donor by transfusion
(linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until'

apheresis (adjective)	apheretic (adjective)
	relating to or formed by or consisting of aphaeresis