strategic warning vs warning

strategic warning and warning both are nouns.

Word	Noun	Adjective	Verb	Adverb
strategic warning	Yes	No	No	No
warning	Yes	Yes	No	No

As nouns, warning is a hypernym of strategic warning; that is, warning is a word with a broader meaning than strategic warning:

strategic warning: (military) a warning prior to the start of a threatening act
warning: a message informing of danger

strategic warning (noun)	warning (noun)
(military) a warning prior to the start of a threatening act	a message informing of danger
	cautionary advice about something imminent (especially imminent danger or other unpleasantness)
	notification of something, usually in advance

strategic warning (adjective)	warning (adjective)
	serving to warn