train vs sight

train and sight both are nouns.

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

As verbs, sight is a hyponym of train; that is, sight 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
sight: take aim by looking through the sights of a gun (or other device)

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

train (noun)	sight (noun)
public transport provided by a line of railway cars coupled together and drawn by a locomotive	the act of looking or seeing or observing
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed	the ability to see; the visual faculty
piece of cloth forming the long back section of a gown that is drawn along the floor	an instance of visual perception
a series of consequences wrought by an event	the range of vision
a procession (of wagons or mules or camels) traveling together in single file	a range of mental vision
a sequentially ordered set of things or events or ideas in which each successive member is related to the preceding	a place of interest, especially to visitors
	anything that is seen
	(often followed by `of') a large number or amount or extent

train (verb)	sight (verb)
exercise in order to prepare for an event or competition	catch sight of; to perceive with the eyes
undergo training or instruction in preparation for a particular role, function, or profession	take aim by looking through the sights of a gun (or other device)
create by training and teaching
teach and supervise (someone); act as a trainer or coach (to), as in sports
point or cause to go (blows, weapons, or objects such as photographic equipment) towards
drag loosely along a surface; allow to sweep the ground
travel by rail or train
educate for a future role or function
teach or refine to be discriminative in taste or judgment
develop (a child's or animal's) behavior by instruction and practice; especially to teach self-control
cause to grow in a certain way by tying and pruning it