day vs night

day and night both are nouns.

Word	Noun	Adjective	Verb	Adverb
day	Yes	No	No	No
night	Yes	No	No	No

day (noun)	night (noun)
a period of opportunity	darkness
time for Earth to make a complete rotation on its axis	the time after sunset and before sunrise while it is dark outside
a day assigned to a particular purpose or observance	a period of ignorance or backwardness or gloom
the time after sunrise and before sunset while it is light outside	the dark part of the diurnal cycle considered a time unit
a point or period in time	the time between sunset and midnight
the recurring hours when you are not sleeping (especially those when you are working)	the period spent sleeping
an era of existence or influence	a shortening of nightfall
the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis