lustrum vs time period

lustrum and time period both are nouns.

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

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

Other hypernyms of lustrum include period, period of time.

lustrum (noun)	time period (noun)
a ceremonial purification of the Roman population every five years following the census	an amount of time
a period lasting five years