work out vs train

work out is not a noun while train is a noun.

Word	Noun	Adjective	Verb	Adverb
work out	No	No	Yes	No
train	Yes	No	Yes	No

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

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

work out (noun)	train (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

work out (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
come up with	create by training and teaching
work out in detail	teach and supervise (someone); act as a trainer or coach (to), as in sports
find the solution to (a problem or question) or understand the meaning of	point or cause to go (blows, weapons, or objects such as photographic equipment) towards
make a mathematical calculation or computation	drag loosely along a surface; allow to sweep the ground
be calculated	travel by rail or train
happen in a certain way, leading to, producing, or resulting in a certain outcome, often well	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