percipient vs discerning

percipient is a noun but discerning is not a noun.

Word	Noun	Adjective	Verb	Adverb
percipient	Yes	Yes	No	No
discerning	No	Yes	No	No

percipient (noun)	discerning (noun)
a person who becomes aware (of things or events) through the senses

percipient (adjective)	discerning (adjective)
characterized by ease and quickness in perceiving	having or revealing keen insight and good judgment
	able to make or detect effects of great subtlety; sensitive
	quick to understand
	unobtrusively perceptive and sympathetic