vigilance vs alertness

vigilance and alertness both are nouns.

Word	Noun	Adjective	Verb	Adverb
vigilance	Yes	No	No	No
alertness	Yes	No	No	No

As nouns, vigilance and alertness are synonyms defined as:

vigilance and alertness: the process of paying close and continuous attention

Other synonyms of vigilance include wakefulness, watchfulness.

vigilance (noun)	alertness (noun)
vigilant attentiveness	lively attentiveness
the process of paying close and continuous attention	the process of paying close and continuous attention
	a state of readiness to respond