newspaper headline vs heading

newspaper headline and heading both are nouns.

Word	Noun	Adjective	Verb	Adverb
newspaper headline	Yes	No	No	No
heading	Yes	No	No	No

As nouns, heading is a hypernym of newspaper headline; that is, heading is a word with a broader meaning than newspaper headline:

newspaper headline: the heading or caption of a newspaper article
heading: a line of text serving to indicate what the passage below it is about

Other hypernyms of newspaper headline include head, header.

newspaper headline (noun)	heading (noun)
the heading or caption of a newspaper article	a horizontal (or nearly horizontal) passageway in a mine
	a line of text serving to indicate what the passage below it is about
	the direction or path along which something moves or along which it lies