brown pine vs coniferous tree

brown pine and coniferous tree both are nouns.

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

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

brown pine: large Australian tree with straight-grained yellow wood that turns brown on exposure
coniferous tree: any gymnospermous tree or shrub bearing cones

Other hypernyms of brown pine include conifer.

brown pine (noun)	coniferous tree (noun)
large Australian tree with straight-grained yellow wood that turns brown on exposure	any gymnospermous tree or shrub bearing cones