vigilant vs argus-eyed

vigilant and argus-eyed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
vigilant	No	Yes	No	No
argus-eyed	No	Yes	No	No

As adjectives, vigilant and argus-eyed are synonyms defined as:

vigilant and argus-eyed: carefully observant or attentive; on the lookout for possible danger

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

vigilant (adjective)	argus-eyed (adjective)
carefully observant or attentive; on the lookout for possible danger	carefully observant or attentive; on the lookout for possible danger
	having very keen vision