grey-leaf pine vs true pine

grey-leaf pine and true pine both are nouns.

Word	Noun	Adjective	Verb	Adverb
grey-leaf pine	Yes	No	No	No
true pine	Yes	No	No	No

As nouns, true pine is a hypernym of grey-leaf pine; that is, true pine is a word with a broader meaning than grey-leaf pine:

grey-leaf pine: medium-sized five-needled pine of southwestern California having long cylindrical cones
true pine: a coniferous tree

Other hypernyms of grey-leaf pine include pine, pine tree.

grey-leaf pine (noun)	true pine (noun)
medium-sized five-needled pine of southwestern California having long cylindrical cones	a coniferous tree