argus-eyed vs open-eyed

argus-eyed and open-eyed both are adjectives.

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

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

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

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

argus-eyed (adjective)	open-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