Hz vs cycles/second

Hz and cycles/second both are nouns.

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

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

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

Other synonyms of Hz include cps, cycle, cycle per second, hertz.

Hz (noun)	cycles/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)