destroyer escort vs warship

destroyer escort and warship both are nouns.

Word	Noun	Adjective	Verb	Adverb
destroyer escort	Yes	No	No	No
warship	Yes	No	No	No

As nouns, warship is a hypernym of destroyer escort; that is, warship is a word with a broader meaning than destroyer escort:

destroyer escort: warship smaller than a destroyer; designed to escort fleets or convoys
warship: a government ship that is available for waging war

Other hypernyms of destroyer escort include combat ship, war vessel.

destroyer escort (noun)	warship (noun)
warship smaller than a destroyer; designed to escort fleets or convoys	a government ship that is available for waging war