kilocycle per second vs kHz

kilocycle per second and kHz both are nouns.

Word	Noun	Adjective	Verb	Adverb
kilocycle per second	Yes	No	No	No
kHz	Yes	No	No	No

As nouns, kilocycle per second and kHz are synonyms defined as:

Other synonyms of kilocycle per second include kc, kilocycle, kilohertz.

kilocycle per second (noun)	kHz (noun)
one thousand periods per second	one thousand periods per second