fogsignal vs alert

fogsignal and alert both are nouns.

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

As nouns, alert is a hypernym of fogsignal; that is, alert is a word with a broader meaning than fogsignal:

Other hypernyms of fogsignal include alarm, alarum, warning signal.

fogsignal (noun)	alert (noun)
a loud low warning signal that can be heard by fogbound ships	a warning serves to make you more alert to danger
	an automatic signal (usually a sound) warning of danger
	condition of heightened watchfulness or preparation for action

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

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