argus-eyed vs keen-sighted

argus-eyed and keen-sighted both are adjectives.

Word	Noun	Adjective	Verb	Adverb
argus-eyed	No	Yes	No	No
keen-sighted	No	Yes	No	No

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

Other synonyms of argus-eyed include hawk-eyed, lynx-eyed, quick-sighted, sharp-eyed, sharp-sighted.

argus-eyed (adjective)	keen-sighted (adjective)
carefully observant or attentive; on the lookout for possible danger	capable of seeing to a great distance
having very keen vision	having very keen vision