knobcone pine vs pine tree

knobcone pine and pine tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
knobcone pine	Yes	No	No	No
pine tree	Yes	No	No	No

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

knobcone pine: medium-sized three-needled pine of the Pacific coast of the United States having a prominent knob on each scale of the cone
pine tree: a coniferous tree

Other hypernyms of knobcone pine include pine, true pine.

knobcone pine (noun)	pine tree (noun)
medium-sized three-needled pine of the Pacific coast of the United States having a prominent knob on each scale of the cone	a coniferous tree