observing vs perceptive

observing and perceptive both are adjectives.

Word	Noun	Adjective	Verb	Adverb
observing	No	Yes	No	No
perceptive	No	Yes	No	No

observing (adjective)	perceptive (adjective)
quick to notice; showing quick and keen perception	having the ability to perceive or understand; keen in discernment
	of or relating to perception