clock up vs log up

clock up and log up both are verbs.

Word	Noun	Adjective	Verb	Adverb
clock up	No	No	Yes	No
log up	No	No	Yes	No

As verbs, clock up and log up are synonyms defined as:

clock up (verb)	log up (verb)
record a distance travelled; on planes and cars	record a distance travelled; on planes and cars