trace vs tracer

trace and tracer both are nouns.

Word	Noun	Adjective	Verb	Adverb
trace	Yes	No	Yes	No
tracer	Yes	No	No	No

trace (noun)	tracer (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	ammunition whose flight can be observed by a trail of smoke
either of two lines that connect a horse's harness to a wagon or other vehicle or to a whiffletree	(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
an indication that something has been present	an instrument used to make tracings
a suggestion of some quality	an investigator who is employed to find missing persons or missing goods
a visible mark (as a footprint) left by the passage of person or animal or vehicle
a just detectable amount

trace (verb)	tracer (verb)
follow, discover, or ascertain the course of development of something
read with difficulty
make a mark or lines on a surface
copy by following the lines of the original drawing on a transparent sheet placed upon it; make a tracing of
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