lactation vs time period

lactation and time period both are nouns.

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

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

Other hypernyms of lactation include period, period of time.

lactation (noun)	time period (noun)
feeding an infant by giving suck at the breast	an amount of time
the production and secretion of milk by the mammary glands
the period following birth during which milk is secreted