follow vs trail

follow is not a noun while trail is a noun.

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

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

Other hyponyms of follow include stalk, chase, chase after, dog, give chase, go after, tag, tail, track, haunt, stalk.

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

follow (verb)	trail (verb)
behave in accordance or in agreement with	drag loosely along a surface; allow to sweep the ground
keep informed	hang down so as to drag along the ground
keep to	go after with the intent to catch
follow, discover, or ascertain the course of development of something	move, proceed, or walk draggingly or slowly
grasp the meaning	to lag or linger behind
imitate in behavior; take as a model
perform an accompaniment to
to travel behind, go after, come after
travel along a certain course
follow in or as if in pursuit
keep under surveillance
choose and follow; as of theories, ideas, policies, strategies or plans
to subscribe to someone's updates on social media
to be subscribed to updates from another user on social media
act in accordance with someone's rules, commands, or wishes
be the successor (of)
follow with the eyes or the mind
work in a specific place, with a specific subject, or in a specific function
accept and follow the leadership or command or guidance of
adhere to or practice
be later in time
come after in time, as a result
be next
to bring something about at a later time than
to be the product or result
come as a logical consequence; follow logically