millenary vs time period

millenary and time period both are nouns.

Word	Noun	Adjective	Verb	Adverb
millenary	Yes	Yes	No	No
time period	Yes	No	No	No

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

Other hypernyms of millenary include period, period of time.

millenary (noun)	time period (noun)
a sum or aggregate of one thousand (especially one thousand years)	an amount of time
a span of 1000 years
the 1000th anniversary (or the celebration of it)

millenary (adjective)	time period (adjective)
relating to or consisting of 1000
of or relating to the doctrine of the millennium