yellow pine vs true pine

yellow pine and true pine both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow pine	Yes	No	No	No
true pine	Yes	No	No	No

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

Other hypernyms of yellow pine include pine, pine tree.

yellow pine (noun)	true pine (noun)
any of various pines having yellow wood	a coniferous tree
hard yellowish wood of a yellow pine