trail vs mountain trail

trail and mountain trail both are nouns.

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

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

Other hyponyms of trail include cattle trail, deer trail, horse-trail, Indian trail, ski run, ski trail.

trail (noun)	mountain trail (noun)
a path or track roughly blazed through wild or hilly country	a trail through mountainous country
evidence pointing to a possible solution
a track or mark left by something that has passed

trail (verb)	mountain trail (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