trail vs trailing

trail and trailing both are nouns.

Word	Noun	Adjective	Verb	Adverb
trail	Yes	No	Yes	No
trailing	Yes	No	No	No

trail (noun)	trailing (noun)
a path or track roughly blazed through wild or hilly country	the pursuit (of a person or animal) by following tracks or marks they left behind
evidence pointing to a possible solution
a track or mark left by something that has passed

trail (verb)	trailing (verb)
drag loosely along a surface; allow to sweep the ground
hang down so as to drag along the ground
go after with the intent to catch
move, proceed, or walk draggingly or slowly
to lag or linger behind