lookout vs watchman

lookout and watchman both are nouns.

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

As nouns, watchman is a hypernym of lookout; that is, watchman is a word with a broader meaning than lookout:

Other hypernyms of lookout include security guard, watcher.

lookout (noun)	watchman (noun)
the act of looking out	a guard who keeps watch
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