observe vs observation

observe is not a noun while observation is a noun.

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

observe (noun)	observation (noun)
	the act of observing; taking a patient look
	the act of making and recording a measurement
	the act of noticing or paying attention
	facts learned by observing
	a remark expressing careful consideration

observe (verb)	observation (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