pine tree vs coniferous tree

pine tree and coniferous tree both are nouns.

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

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

Other hypernyms of pine tree include conifer.

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