observe vs observant

observe is not an adjective while observant is an adjective.

Word	Noun	Adjective	Verb	Adverb
observe	No	No	Yes	No
observant	No	Yes	No	No

observe (adjective)	observant (adjective)
	paying close attention especially to details
	(of individuals) adhering strictly to laws and rules and customs
	quick to notice; showing quick and keen perception

observe (verb)	observant (verb)
stick to correctly or closely
make mention of
watch attentively
observe with care or pay close attention to
discover or determine the existence, presence, or fact of by perception with the eyes
follow with the eyes or the mind
show respect towards
behave as expected during of holidays or rites
conform one's action or practice to