swamp pine vs pine tree

swamp pine and pine tree both are nouns.

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

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

swamp pine: any of several pines that prefer or endure moist situations such as loblolly pine or longleaf pine
pine tree: a coniferous tree

Other hypernyms of swamp pine include pine, true pine.

swamp pine (noun)	pine tree (noun)
any of several pines that prefer or endure moist situations such as loblolly pine or longleaf pine	a coniferous tree