cycles/second vs hertz

cycles/second and hertz both are nouns.

Word	Noun	Adjective	Verb	Adverb
cycles/second	Yes	No	No	No
hertz	Yes	No	No	No

As nouns, cycles/second and hertz are synonyms defined as:

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

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

cycles/second (noun)	hertz (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)