jack pine vs pine tree

jack pine and pine tree both are nouns.

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

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

jack pine: slender medium-sized two-needled pine of eastern North America; with yellow-green needles and scaly grey to red-brown fissured bark
pine tree: a coniferous tree

Other hypernyms of jack pine include pine, true pine.

jack pine (noun)	pine tree (noun)
slender medium-sized two-needled pine of eastern North America; with yellow-green needles and scaly grey to red-brown fissured bark	a coniferous tree