alertness vs alert

alertness and alert both are nouns.

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

alertness (noun)	alert (noun)
lively attentiveness	a warning serves to make you more alert to danger
the process of paying close and continuous attention	an automatic signal (usually a sound) warning of danger
a state of readiness to respond	condition of heightened watchfulness or preparation for action

alertness (adjective)	alert (adjective)
	engaged in or accustomed to close observation
	mentally perceptive and responsive
	quick and energetic

alertness (verb)	alert (verb)
	warn or arouse to a sense of danger or call to a state of preparedness