vigilant vs watchful

vigilant and watchful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
vigilant	No	Yes	No	No
watchful	No	Yes	No	No

As adjectives, vigilant and watchful are synonyms defined as:

vigilant and watchful: carefully observant or attentive; on the lookout for possible danger

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

vigilant (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