donkey engine vs locomotive

donkey engine and locomotive both are nouns.

Word	Noun	Adjective	Verb	Adverb
donkey engine	Yes	No	No	No
locomotive	Yes	Yes	No	No

As nouns, locomotive is a hypernym of donkey engine; that is, locomotive is a word with a broader meaning than donkey engine:

donkey engine: a locomotive for switching rolling stock in a railroad yard
locomotive: a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks

Other hypernyms of donkey engine include engine, locomotive engine, railway locomotive.

donkey engine (noun)	locomotive (noun)
(nautical) a small engine (as one used on board ships to operate a windlass)	a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks
a locomotive for switching rolling stock in a railroad yard

donkey engine (adjective)	locomotive (adjective)
	of or relating to locomotion