observe vs take note

observe and take note both are verbs.

Word	Noun	Adjective	Verb	Adverb
observe	No	No	Yes	No
take note	No	No	Yes	No

As verbs, observe and take note are synonyms defined as:

Other synonyms of observe include note.

observe (verb)	take note (verb)
stick to correctly or closely	observe with care or pay close attention to
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