puerperium vs time period

puerperium and time period both are nouns.

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

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

puerperium: time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved
time period: an amount of time

Other hypernyms of puerperium include period, period of time.

puerperium (noun)	time period (noun)
time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved	an amount of time