duration vs time period

duration and time period both are nouns.

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

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

Other hypernyms of duration include period, period of time.

duration (noun)	time period (noun)
continuance in time	an amount of time
the property of enduring or continuing in time
the period of time during which something continues