real-time vs real time

real-time is not a noun while real time is a noun.

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

real-time (noun)	real time (noun)
	(computer science) the time it takes for a process under computer control to occur
	the actual time that it takes a process to occur

real-time (adjective)	real time (adjective)
of or relating to computer systems that update information at the same rate they receive information