tracer vs trace

tracer and trace both are nouns.

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

tracer (noun)	trace (noun)
ammunition whose flight can be observed by a trail of smoke	a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image
(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes	either of two lines that connect a horse's harness to a wagon or other vehicle or to a whiffletree
an instrument used to make tracings	an indication that something has been present
an investigator who is employed to find missing persons or missing goods	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

tracer (verb)	trace (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