coaling station vs harbour

coaling station and harbour both are nouns.

Word	Noun	Adjective	Verb	Adverb
coaling station	Yes	No	No	No
harbour	Yes	No	Yes	No

As nouns, harbour is a hypernym of coaling station; that is, harbour is a word with a broader meaning than coaling station:

Other hypernyms of coaling station include harbor, haven, seaport.

coaling station (noun)	harbour (noun)
a seaport where ships can take on supplies of coal	a place of refuge and comfort and security
	a sheltered port where ships can take on or discharge cargo

coaling station (verb)	harbour (verb)
	maintain (a theory, thoughts, or feelings)
	hold back a thought or feeling about
	keep in one's possession; of animals
	secretly shelter (as of fugitives or criminals)