lap up vs lap

lap up is not a noun while lap is a noun.

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

As verbs, lap up and lap are synonyms defined as:

Other synonyms of lap up include lick.

lap up (noun)	lap (noun)
	touching with the tongue
	movement once around a course
	a flap that lies over another part
	the part of a piece of clothing that covers the thighs
	the upper side of the thighs of a seated person
	an area of control or responsibility

lap up (verb)	lap (verb)
take up with the tongue	wash or flow against
	take up with the tongue
	pass the tongue over
	move with or cause to move with a whistling or hissing sound
	lie partly over or alongside of something or of one another