sentiency vs mental faculty

sentiency and mental faculty both are nouns.

Word	Noun	Adjective	Verb	Adverb
sentiency	Yes	No	No	No
mental faculty	Yes	No	No	No

As nouns, mental faculty is a hypernym of sentiency; that is, mental faculty is a word with a broader meaning than sentiency:

sentiency: the faculty through which the external world is apprehended
mental faculty: one of the inherent cognitive or perceptual powers of the mind

Other hypernyms of sentiency include faculty, module.

sentiency (noun)	mental faculty (noun)
the faculty through which the external world is apprehended	one of the inherent cognitive or perceptual powers of the mind