real time vs period

real time and period both are nouns.

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

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

real time: (computer science) the time it takes for a process under computer control to occur
period: an amount of time

Other hypernyms of real time include period of time, time period.

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

Other hypernyms of real time include period of time, time period.

real time (noun)	period (noun)
(computer science) the time it takes for a process under computer control to occur	a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
the actual time that it takes a process to occur	the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
	an amount of time
	the interval taken to complete one cycle of a regularly repeating phenomenon
	a unit of geological time during which a system of rocks formed
	the end or completion of something
	(ice hockey) one of three divisions into which play is divided in hockey games