shunter vs railway locomotive

shunter and railway locomotive both are nouns.

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

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

shunter: a small locomotive used to move cars around but not to make trips
railway locomotive: a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks

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

shunter (noun)	railway locomotive (noun)
a small locomotive used to move cars around but not to make trips	a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks