observatory vs lookout

observatory and lookout both are nouns.

Word	Noun	Adjective	Verb	Adverb
observatory	Yes	No	No	No
lookout	Yes	No	No	No

As nouns, observatory and lookout are synonyms defined as:

observatory and lookout: a structure commanding a wide view of its surroundings

Other synonyms of observatory include lookout station, observation tower.

observatory (noun)	lookout (noun)
a building designed and equipped to observe astronomical phenomena	the act of looking out
a structure commanding a wide view of its surroundings	a structure commanding a wide view of its surroundings
	an elevated post affording a wide view
	a person employed to keep watch for some anticipated event