observation vs watching

observation and watching both are nouns.

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

As nouns, observation and watching are synonyms defined as:

Other synonyms of observation include observance.

observation (noun)	watching (noun)
the act of observing; taking a patient look	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