train vs direct

train is a noun but direct is not a noun.

Word	Noun	Adjective	Verb	Adverb
train	Yes	No	Yes	No
direct	No	Yes	Yes	Yes

As verbs, train and direct are synonyms defined as:

train and direct: point or cause to go (blows, weapons, or objects such as photographic equipment) towards

Other synonyms of train include aim, take, take aim.

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

train: point or cause to go (blows, weapons, or objects such as photographic equipment) towards
direct: intend (something) to move towards a certain goal

Other hyponyms of train include aim, place, point, target, draw a bead on, hold, turn, swing, charge, level, point, level, sight.

train (noun)	direct (noun)
public transport provided by a line of railway cars coupled together and drawn by a locomotive
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed
piece of cloth forming the long back section of a gown that is drawn along the floor
a series of consequences wrought by an event
a procession (of wagons or mules or camels) traveling together in single file
a sequentially ordered set of things or events or ideas in which each successive member is related to the preceding

train (adjective)	direct (adjective)
	direct in spatial dimensions; proceeding without deviation or interruption; straight and short
	(of a current) flowing in one direction only
	straightforward in means or manner or behavior or language or action
	similar in nature or effect or relation to another quantity
	in a straight unbroken line of descent from parent to child
	moving from west to east on the celestial sphere; or--for planets--around the sun in the same direction as the Earth
	lacking compromising or mitigating elements
	in precisely the same words used by a writer or speaker
	having no intervening persons, agents, conditions
	being an immediate result or consequence

train (verb)	direct (verb)
exercise in order to prepare for an event or competition	plan and direct (a complex undertaking)
undergo training or instruction in preparation for a particular role, function, or profession	specifically design a product, event, or activity for a certain public
create by training and teaching	command with authority
teach and supervise (someone); act as a trainer or coach (to), as in sports	give directions to; point somebody into a certain direction
point or cause to go (blows, weapons, or objects such as photographic equipment) towards	put an address on (an envelope)
drag loosely along a surface; allow to sweep the ground	point or cause to go (blows, weapons, or objects such as photographic equipment) towards
travel by rail or train	intend (something) to move towards a certain goal
educate for a future role or function	guide the actors in (plays and films)
teach or refine to be discriminative in taste or judgment	lead, as in the performance of a composition
develop (a child's or animal's) behavior by instruction and practice; especially to teach self-control	take somebody somewhere
cause to grow in a certain way by tying and pruning it	cause to go somewhere
	direct the course; determine the direction of travelling
	govern or manage

train (adverb)	direct (adverb)
	without deviation