uptime vs time period

uptime and time period both are nouns.

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

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

uptime: a period of time when something (as a machine or factory) is functioning and available for use
time period: an amount of time

Other hypernyms of uptime include period, period of time.

uptime (noun)	time period (noun)
a period of time when something (as a machine or factory) is functioning and available for use	an amount of time