kHz vs kilocycle per second

kHz and kilocycle per second both are nouns.

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

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

Other synonyms of kHz include kc, kilocycle, kilohertz.

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