trace vs keep up

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

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

trace (noun)	keep up (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

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