dinkey vs railway locomotive

dinkey and railway locomotive both are nouns.

Word	Noun	Adjective	Verb	Adverb
dinkey	Yes	No	No	No
railway locomotive	Yes	No	No	No

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

dinkey: a small locomotive
railway locomotive: a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks

Other hypernyms of dinkey include engine, locomotive, locomotive engine.

dinkey (noun)	railway locomotive (noun)
a small locomotive	a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks