night vs period

night and period both are nouns.

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

As nouns, period is a hypernym of night; that is, period is a word with a broader meaning than night:

Other hypernyms of night include period of time, time period.

As nouns, period is a hypernym of night; that is, period is a word with a broader meaning than night:

Other hypernyms of night include period of time, time period.

As nouns, period is a hypernym of night; that is, period is a word with a broader meaning than night:

Other hypernyms of night include period of time, time period.

As nouns, period is a hypernym of night; that is, period is a word with a broader meaning than night:

Other hypernyms of night include period of time, time period.

night (noun)	period (noun)
darkness	a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
the time after sunset and before sunrise while it is dark outside	the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
a period of ignorance or backwardness or gloom	an amount of time
the dark part of the diurnal cycle considered a time unit	the interval taken to complete one cycle of a regularly repeating phenomenon
the time between sunset and midnight	a unit of geological time during which a system of rocks formed
the period spent sleeping	the end or completion of something
a shortening of nightfall	(ice hockey) one of three divisions into which play is divided in hockey games