drag vs trail

drag and trail both are nouns.

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

As verbs, trail is a hyponym of drag; that is, trail is a word with a more specific, narrower meaning than drag:

Other hyponyms of drag include pull along, schlep, shlep, train.

As verbs, drag and trail are synonyms defined as:

Other synonyms of drag include drop back, drop behind, get behind, hang back.

drag (noun)	trail (noun)
the act of dragging (pulling with force)	a path or track roughly blazed through wild or hilly country
a slow inhalation (as of tobacco smoke)	evidence pointing to a possible solution
clothing that is conventionally worn by the opposite sex (especially women's clothing when worn by a man)	a track or mark left by something that has passed
something tedious and boring
something that slows or delays progress
the phenomenon of resistance to motion through a fluid

drag (verb)	trail (verb)
proceed for an extended period of time	drag loosely along a surface; allow to sweep the ground
persuade to come away from something attractive or interesting	hang down so as to drag along the ground
suck in or take (air)	go after with the intent to catch
pull, as against a resistance	move, proceed, or walk draggingly or slowly
draw slowly or heavily	to lag or linger behind
search (as the bottom of a body of water) for something valuable or lost
to lag or linger behind
walk without lifting the feet
move slowly and as if with great effort
use an input device to move objects on the screen, or to select items (such as commands from a menu); drag the slider to increase or decrease rate; drag the handles on the image to resize it
force into some kind of situation, condition, or course of action