exercise vs train

exercise and train both are nouns.

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

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

Other hyponyms of exercise include limber up, loosen up, warm up, tumble, strengthen, tone, tone up, press, weight-lift, weightlift.

exercise (noun)	train (noun)
the activity of exerting your muscles in various ways to keep fit	public transport provided by a line of railway cars coupled together and drawn by a locomotive
a task performed or problem solved in order to develop skill or understanding	wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed
systematic training by multiple repetitions	piece of cloth forming the long back section of a gown that is drawn along the floor
the act of using	a series of consequences wrought by an event
an action, often used negatively and without consequences	a procession (of wagons or mules or camels) traveling together in single file
(usually plural) a ceremony that involves processions and speeches	a sequentially ordered set of things or events or ideas in which each successive member is related to the preceding

exercise (verb)	train (verb)
do physical exercise	exercise in order to prepare for an event or competition
give a workout to	undergo training or instruction in preparation for a particular role, function, or profession
learn by repetition	create by training and teaching
put to use	teach and supervise (someone); act as a trainer or coach (to), as in sports
carry out or practice; as of jobs and professions	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