latency vs reaction time

latency and reaction time both are nouns.

Word	Noun	Adjective	Verb	Adverb
latency	Yes	No	No	No
reaction time	Yes	No	No	No

As nouns, latency and reaction time are synonyms defined as:

latency and reaction time: the time that elapses between a stimulus and the response to it

Other synonyms of latency include latent period, response time.

latency (noun)	reaction time (noun)
the state of being not yet evident or active	the time that elapses between a stimulus and the response to it
the time that elapses between a stimulus and the response to it
(computer science) the time it takes for a specific block of data on a data track to rotate around to the read/write head