headland vs natural elevation

headland and natural elevation both are nouns.

Word	Noun	Adjective	Verb	Adverb
headland	Yes	No	No	No
natural elevation	Yes	No	No	No

As nouns, natural elevation is a hypernym of headland; that is, natural elevation is a word with a broader meaning than headland:

headland: a natural elevation (especially a rocky one that juts out into the sea)
natural elevation: a raised or elevated geological formation

Other hypernyms of headland include elevation.

headland (noun)	natural elevation (noun)
a natural elevation (especially a rocky one that juts out into the sea)	a raised or elevated geological formation