clock time vs SCLK

clock time and SCLK both are nouns.

Word	Noun	Adjective	Verb	Adverb
clock time	Yes	No	No	No
SCLK	Yes	No	No	No

As nouns, SCLK is a hyponym of clock time; that is, SCLK is a word with a more specific, narrower meaning than clock time:

Other hyponyms of clock time include spacecraft clock time, prime time, hour, time of day.

clock time (noun)	SCLK (noun)
a reading of a point in time as given by a clock	the clock time given by a clock carried on board a spacecraft