sentience vs sentiency

sentience and sentiency both are nouns.

Word	Noun	Adjective	Verb	Adverb
sentience	Yes	No	No	No
sentiency	Yes	No	No	No

As nouns, sentience and sentiency are synonyms defined as:

sentience and sentiency: the faculty through which the external world is apprehended

Other synonyms of sentience include sensation, sense, sensory faculty.

sentience (noun)	sentiency (noun)
the readiness to perceive sensations; elementary or undifferentiated consciousness	the faculty through which the external world is apprehended
the faculty through which the external world is apprehended
state of elementary or undifferentiated consciousness