tracer vs ammo

tracer and ammo both are nouns.

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

As nouns, ammo is a hypernym of tracer; that is, ammo is a word with a broader meaning than tracer:

Other hypernyms of tracer include ammunition.

tracer (noun)	ammo (noun)
ammunition whose flight can be observed by a trail of smoke	projectiles to be fired from a gun
(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
an instrument used to make tracings
an investigator who is employed to find missing persons or missing goods