alertness vs watchfulness

alertness and watchfulness both are nouns.

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

As nouns, alertness and watchfulness are synonyms defined as:

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

Other synonyms of alertness include vigilance, wakefulness.

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