watchfulness vs alertness

watchfulness and alertness both are nouns.

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

As nouns, watchfulness and alertness are synonyms defined as:

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

Other synonyms of watchfulness include vigilance, wakefulness.

watchfulness (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