log up vs log

log up is not a noun while log is a noun.

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

log up (noun)	log (noun)
	measuring instrument that consists of a float that trails from a ship by a knotted line in order to measure the ship's speed through the water
	a written record of events on a voyage (of a ship or plane)
	the exponent required to produce a given number
	a written record of messages sent or received
	a segment of the trunk of a tree when stripped of branches

log up (verb)	log (verb)
record a distance travelled; on planes and cars	enter into a log, as on ships and planes
	cut lumber, as in woods and forests