train vs drill

train and drill both are nouns.

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

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

train: undergo training or instruction in preparation for a particular role, function, or profession
drill: undergo military training or do military exercises

Other hyponyms of train include apprentice, retrain.

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

Other hyponyms of train include retrain, house-train, housebreak, toilet-train.

train (noun)	drill (noun)
public transport provided by a line of railway cars coupled together and drawn by a locomotive	systematic training by multiple repetitions
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed	(military) the training of soldiers to march (as in ceremonial parades) or to perform the manual of arms
piece of cloth forming the long back section of a gown that is drawn along the floor	similar to the mandrill but smaller and less brightly colored
a series of consequences wrought by an event	a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)
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 (verb)	drill (verb)
exercise in order to prepare for an event or competition	learn by repetition
undergo training or instruction in preparation for a particular role, function, or profession	teach by repetition
create by training and teaching	train in the military, e.g., in the use of weapons
teach and supervise (someone); act as a trainer or coach (to), as in sports	undergo military training or do military exercises
point or cause to go (blows, weapons, or objects such as photographic equipment) towards	make a hole, especially with a pointed power or hand tool
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