vigil vs wakefulness

vigil and wakefulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
vigil	Yes	No	No	No
wakefulness	Yes	No	No	No

As nouns, wakefulness is a hypernym of vigil; that is, wakefulness is a word with a broader meaning than vigil:

vigil: a period of sleeplessness
wakefulness: a periodic state during which you are conscious and aware of the world

vigil (noun)	wakefulness (noun)
a purposeful surveillance to guard or observe	a periodic state during which you are conscious and aware of the world
the rite of staying awake for devotional purposes (especially on the eve of a religious festival)	the process of paying close and continuous attention
a period of sleeplessness	a temporary state in which you are unable (or unwilling) to sleep