hertz vs cycle per second

hertz and cycle per second both are nouns.

Word	Noun	Adjective	Verb	Adverb
hertz	Yes	No	No	No
cycle per second	Yes	No	No	No

As nouns, hertz and cycle per second are synonyms defined as:

hertz and cycle per second: the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz)

Other synonyms of hertz include cps, cycle, cycles/second, Hz.

hertz (noun)	cycle per second (noun)
the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz)	the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz)