kilocycle per second vs kilohertz

kilocycle per second and kilohertz both are nouns.

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

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

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

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