gunboat diplomacy vs diplomacy

gunboat diplomacy and diplomacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
gunboat diplomacy	Yes	No	No	No
diplomacy	Yes	No	No	No

As nouns, diplomacy is a hypernym of gunboat diplomacy; that is, diplomacy is a word with a broader meaning than gunboat diplomacy:

gunboat diplomacy: diplomacy in which the nations threaten to use force in order to obtain their objectives
diplomacy: negotiation between nations

Other hypernyms of gunboat diplomacy include diplomatic negotiations.

gunboat diplomacy (noun)	diplomacy (noun)
diplomacy in which the nations threaten to use force in order to obtain their objectives	subtly skillful handling of a situation
	wisdom in the management of public affairs
	negotiation between nations