open-eyed vs watchful

open-eyed and watchful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
open-eyed	No	Yes	No	No
watchful	No	Yes	No	No

As adjectives, open-eyed and watchful are synonyms defined as:

open-eyed and watchful: carefully observant or attentive; on the lookout for possible danger

Other synonyms of open-eyed include argus-eyed, vigilant, wakeful.

open-eyed (adjective)	watchful (adjective)
carefully observant or attentive; on the lookout for possible danger	engaged in or accustomed to close observation
	experiencing or accompanied by sleeplessness
	carefully observant or attentive; on the lookout for possible danger