keep up vs trace

keep up is not a noun while trace is a noun.

Word	Noun	Adjective	Verb	Adverb
keep up	No	No	Yes	No
trace	Yes	No	Yes	No

keep up (noun)	trace (noun)
	a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image
	either of two lines that connect a horse's harness to a wagon or other vehicle or to a whiffletree
	an indication that something has been present
	a suggestion of some quality
	a visible mark (as a footprint) left by the passage of person or animal or vehicle
	a just detectable amount

keep up (verb)	trace (verb)
prevent from going to bed at night	follow, discover, or ascertain the course of development of something
keep informed	read with difficulty
maintain a required pace or level	make a mark or lines on a surface
keep in safety and protect from harm, decay, loss, or destruction	copy by following the lines of the original drawing on a transparent sheet placed upon it; make a tracing of
lengthen or extend in duration or space	pursue or chase relentlessly
	to go back over again
	make one's course or travel along a path; travel or pass over, around, or along
	discover traces of