true pine vs coniferous tree

true pine and coniferous tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
true pine	Yes	No	No	No
coniferous tree	Yes	No	No	No

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

Other hypernyms of true pine include conifer.

true pine (noun)	coniferous tree (noun)
a coniferous tree	any gymnospermous tree or shrub bearing cones