alertness vs sharp-sightedness

alertness and sharp-sightedness both are nouns.

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

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

Other synonyms of alertness include on the qui vive.

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