sharp-sightedness vs alertness

sharp-sightedness and alertness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sharp-sightedness	Yes	No	No	No
alertness	Yes	No	No	No

As nouns, sharp-sightedness and alertness are synonyms defined as:

Other synonyms of sharp-sightedness include on the qui vive.

sharp-sightedness (noun)	alertness (noun)
lively attentiveness	lively attentiveness
sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)	the process of paying close and continuous attention
	a state of readiness to respond